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        <title>Frontiers in Materials | Quantum Materials section | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/materials/sections/quantum-materials</link>
        <description>RSS Feed for Quantum Materials section in the Frontiers in Materials journal | New and Recent Articles</description>
        <language>en-us</language>
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        <pubDate>2026-04-06T17:52:02.98+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1465852</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1465852</link>
        <title><![CDATA[Nonlinear dynamics and stability analysis of locally active Mott memristors using a physics-based compact model]]></title>
        <pubdate>2025-05-12T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Wei Yi</author>
        <description><![CDATA[Locally active memristors (LAMs) are a class of emerging nonlinear dynamic circuit elements that hold promise for scalable yet biomimetic neuromorphic circuits. Starting from a physics-based compact model, we performed small-signal linearization analyses and applied Chua’s local activity theory to a one-dimensional, locally active vanadium dioxide Mott memristor based on an insulator-to-metal phase transition. This approach establishes a connection between the dynamical behaviors of a Mott memristor and its physical device parameters, enabling a complete mapping of the locally passive and edge-of-chaos domains in the frequency and current operating parameter space. This mapping could guide materials and device development for neuromorphic circuit applications. We also examined the applicability of local analyses to a second-order relaxation oscillator circuit, which consists of a voltage-biased vanadium dioxide memristor coupled to a parallel reactive capacitor element and a series resistor. Chua’s local activity criteria allows a mapping of this second-order system’s dynamics and stability in the frequency and circuit parameter space, which is essentially a phase diagram for complexity. It shows that the coupling increases both the system’s dimension and its dynamical complexity and creates a locally active and unstable region to host instabilities and persistent oscillations. We show that global nonlinear techniques, including nullclines and phase portraits, provide further insights into instabilities and persistent oscillations near non-hyperbolic fixed points. Specifically, we observe a supercritical Hopf-like bifurcation, where an orbitally stable limit cycle emerges as a new attractor when a stable spiral transitions to an unstable one, with each of the three circuit parameters acting as a bifurcation parameter. The abrupt growth of the limit cycle resembles the Canard explosion phenomenon observed in systems exhibiting relaxation oscillations. Finally, we show that experimental limit cycle oscillations in a vanadium dioxide nano-device relaxation oscillator closely match SPICE simulations based on the compact model.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2025.1550721</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2025.1550721</link>
        <title><![CDATA[Editorial: Symmetry-guided rational design and control of quantum matter with new functionality]]></title>
        <pubdate>2025-02-17T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Nicole A. Benedek</author><author>Milan Radovic</author><author>Berit H. Goodge</author><author>Alberto De la Torre</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1407810</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1407810</link>
        <title><![CDATA[Changes in the structure and composition of nano-sized Ni-Cu multilayer films with increasing temperature in an atmosphere with and without hydrogen]]></title>
        <pubdate>2024-12-19T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>T. Hioki</author><author>Y. Iwamura</author><author>T. Itoh</author><author>M. Saito</author><author>S. Yamauchi</author><author>T. Takahashi</author><author>J. Kasagi</author>
        <description><![CDATA[For a system of a nano-sized Ni-Cu multilayer on a Ni substrate and hydrogen gas, many experimental results suggest an anomalous heat release that may be caused by low-energy nuclear reactions in condensed matter. In this paper, to clarify the structural change of the Ni-Cu multilayer with increasing temperature up to 900°C in an atmosphere with and without hydrogen, an in-situ X-ray diffraction (XRD) study using synchrotron radiation was performed for a system of 6 × {Ni(14 nm)/Cu(2 nm)}/α-SiO2(10 nm)/Si wafer (0.5 mm). The surface morphology observation and elemental analysis for the samples after the XRD measurements were performed using electron microscopy analyses. The XRD peaks from Ni were observed up to 600°C and satellite peaks were observed at 300–600°C, which indicates that the initial multilayer structure with a sharp interface was maintained up to approximately 600°C regardless of the atmosphere. After the temperature had increased to 900°C, the initial Ni-Cu multilayer became a single-layer of Ni-Cu alloy with the nominal composition when the system was heated in an atmosphere containing hydrogen; in a hydrogen-free atmosphere, it became a modified Ni-Cu multilayer, where the thickness of the Cu layer decreased to half of the initial value, and many particles were randomly distributed on the surface. For the Ni-Cu multilayer system, a baking pre-treatment at high temperatures in a hydrogen-free environment is considered advantageous to stimulate the anomalous heat effect if we assume that hydrogen diffusion through the bimetallic interface is one of the key factors that induce anomalous heat generation.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1500487</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1500487</link>
        <title><![CDATA[Nanomaterials engineering for enhanced low energy nuclear reactions: a comprehensive review and future prospects]]></title>
        <pubdate>2024-11-20T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Nurlan Bakranov</author><author>Zhanserik Kuli</author><author>David Nagel</author><author>Dina Bakranova</author>
        <description><![CDATA[This scientific paper aims to provide a thorough examination of the current state of research on nanomaterials in the context of Low Energy Nuclear Reactions (LENR). The paper explores various nanomaterials, their synthesis methods, and their impact on facilitating and enhancing LENR processes. Special attention is given to the unique properties of nanomaterials that make them particularly suitable for LENR applications, such as increased surface area, quantization effects, and improved hydrogen absorption kinetics. The review also delves into experimental findings and theoretical models that shed light on the mechanisms through which nanomaterials induce and support LENR. The sustained interest in LENR arises from experiments consistently demonstrating the potential for significant energy gains, suggesting cost-effective energy production. Furthermore, these processes exhibit advantages such as negligible radiation during operation, minimal radioactive waste, and the absence of greenhouse gas emissions. While the path to commercialization is lengthy, strides are being made by various companies recognizing the challenge of consistently producing materials to reliably trigger LENR. Current research focuses on employing nanoparticles to reliably induce LENR, drawing inspiration from reports indicating the efficacy of loose nanoparticles in triggering these reactions. The hypothesis posits that nanoparticles affixed to surfaces enhance performance and ease of handling in research and commercial setups. The rationale for using nanoparticles lies in their ability to facilitate hydrogen penetration into solid materials, crucial for observing LENR phenomena. This capability is attributed to the substantial surface area of nanoparticles, allowing them to absorb more reactants like hydrogen. Recent studies delve into understanding the behavior of metallic nanoparticles concerning the energy spectrum of electrons and implanted ions as a function of particle size. Notably, as nanoparticles decrease in size, quantization effects emerge, potentially modifying the interaction of quasiparticles within nanoclusters. Specific examples, such as Pd-Rh alloys, demonstrate accelerated hydrogen uptake kinetics in nanoparticles compared to bulk materials, emphasizing the importance of nanoscale properties. This topic provides a broad scope for exploring the intersection of nanomaterials and LENR, allowing for an in-depth analysis of the current state of research and the potential for future advancements. By understanding and harnessing the unique properties of nanomaterials, significant progress can be made in the field of LENR, potentially leading to practical and sustainable energy solutions.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1502051</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1502051</link>
        <title><![CDATA[Manifestations in nature of self-controlled quasi-stationary nuclear fusion into magnetized low-temperature hydrogen plasma]]></title>
        <pubdate>2024-11-12T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Vladimir Vysotskii</author><author>Mykhaylo Vysotskyy</author>
        <description><![CDATA[This paper examines the characteristics of nuclear reactions occurring in low-temperature magnetized deuterium plasma. It is demonstrated that considering the ionization-recombination dynamics of deuterium atoms in this plasma allows for the potential realization of efficient nuclear fusion at low thermal energies kT≈10−20 eV. The study shows that these processes are linked to the formation of coherent correlated states of deuterons, accompanied by the generation of giant energy fluctuations δE≥10−50 keV during each recurring ionization event of deuterium atoms. These findings align with known anomalies in the solar atmosphere, such as the sharp temperature increase above the Sun’s surface and the observed excess concentration of helium-3 ions in the solar wind. Furthermore, this process may explain well-documented experimental results, such as neutron generation during electric discharges in gas.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1470878</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1470878</link>
        <title><![CDATA[Superconductivity in mercurides of strontium]]></title>
        <pubdate>2024-10-30T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Rachel Nixon</author><author>Yurii Prots</author><author>Mitja Krnel</author><author>Nazar Zaremba</author><author>Orest Pavlosiuk</author><author>Marcus Schmidt</author><author>Lev Akselrud</author><author>Yuri Grin</author><author>Eteri Svanidze</author>
        <description><![CDATA[A large variety of chemical and physical properties are exhibited by mercurides and amalgams. In this work, we have successfully examined seven strontium mercurides: SrHg11, SrHg8, Sr10Hg55, SrHg2, SrHg, Sr3Hg2, and Sr3Hg. The interest in the mercury-rich region is motivated by the large number of mercury-based superconductors that have high mercury content. At the same time, the preparation on the mercury-rich side of the binary phase diagram is experimentally non-trivial, due to the high vapor pressure of mercury and extreme air-sensitivity of mercury-rich compounds. By employing a set of specialized techniques, we were able to discover superconductivity in three mercury-strontium compounds – SrHg11 (Tc=3.2±0.3 K, Hc2=0.18±0.05 T), SrHg8 (Tc=3.0±0.1 K, Hc2=0.35±0.02 T), and Sr10Hg55 (Tc=2.2±0.25 K, Hc2=0.54±0.05 T).]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1461579</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1461579</link>
        <title><![CDATA[The 4-Octahedra model]]></title>
        <pubdate>2024-10-22T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Edgar Abarca Morales</author>
        <description><![CDATA[This work comprises a generalization of a simple geometric model originally developed to describe coupled rotations of corner-sharing octahedra in the surface layer of Sr2RuO4 under uniaxial compression. The main objective of the model is to establish a link between the experimental global strain configuration and the possible microscopic mechanisms and compatible geometries by which the octahedra accommodate the applied strain. In achieving this, a useful and intuitive parametrization of four-site two-dimensional systems of corner-sharing octahedra has been established, which can be readily extended to three dimensions and N>4 inequivalent sites or directly employed to analyze the octahedral configuration of many perovskites, transition metal oxides (TMOs), and layered compounds.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1343005</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1343005</link>
        <title><![CDATA[Modern quantum materials]]></title>
        <pubdate>2024-10-09T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Vincent G. Harris</author><author>Parisa Andalib</author>
        <description><![CDATA[Quantum phenomena, including entanglement, superposition, tunneling, and spin–orbit interactions, among others, are foundational to the development of recent innovations in quantum computing, teleportation, encryption, sensing, and new modalities of electronics, such as spintronics, spin-orbitronics, caloritronics, magnonics, twistronics, and valleytronics. These emerging technologies provide disruptive influences to global commercial markets. These remarkable advances in quantum technologies are nearly always enabled by the discovery of materials and their quantum behaviors. Such advances are governed by quantum principles that are strongly influenced by environmental, physical, topological, and morphological conditions such as very small length scales, short time durations, ultrahigh pressures, ultralow temperatures, etc., which lead to quantum behaviors that manifest as quantum tunneling, entanglement, superpositioning, superfluidity, low-dimensional, high-temperature and high-pressure superconductivity, quantum fluctuations, Bose–Einstein condensates, topological effects, and other phenomena that are not yet fully understood nor adequately explored. Here, we provide a review of quantum materials developed up to 2023. Remarkable advances in quantum materials occur daily, and therefore, by the time of publication, new and exciting breakthroughs will have occurred that are regrettably not covered herein.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1444769</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1444769</link>
        <title><![CDATA[Transition metal oxides: a new frontier in spintronics driven by novel quantum states and efficient charge-spin interconversion]]></title>
        <pubdate>2024-08-26T00:00:00Z</pubdate>
        <category>Review</category>
        <author>Yamin Han</author><author>Bin Lao</author><author>Xuan Zheng</author><author>Sheng Li</author><author>Run-Wei Li</author><author>Zhiming Wang</author>
        <description><![CDATA[Transition metal oxides (TMOs) have emerged as promising candidates for spintronic applications due to their unique electronic properties and novel quantum states. The intricate interplay between strong spin-orbit coupling and electronic correlations in TMOs gives rise to distinct spin and orbital textures, leading to enhanced spin-momentum locking and efficient charge-spin interconversion. Remarkably, recent researches have unveiled the significant and highly tunable nature of charge-spin interconversion efficiency in TMOs, which can be manipulated through strategies such as electric field gating, epitaxial strain, and heterostructure engineering. This review provides a comprehensive overview of the recent advances in understanding the electronic band structures of TMOs and their correlation with charge-spin interconversion mechanisms. We summarize the tunability of these properties through various experimental approaches and discuss the potential implications for spintronic device applications. The insights gained from this review can guide future research efforts towards the development of high-performance, energy-efficient spintronic devices based on TMOs.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1448765</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1448765</link>
        <title><![CDATA[Room temperature magnetoelectric magnetic spirals by design]]></title>
        <pubdate>2024-08-19T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Arnau Romaguera</author><author>Marisa Medarde</author>
        <description><![CDATA[Frustrated magnets with ordered magnetic spiral phases that spontaneously break inversion symmetry have received significant attention from both fundamental and applied sciences communities due to the experimental demonstration that some of these materials can couple to the lattice and induce electric polarization. In these materials, the common origin of the electric and magnetic orders guarantees substantial coupling between them, which is highly desirable for applications. However, their low-magnetic ordering temperatures (typically < 100 K) greatly restrict their fields of application. Recently, investigations on Cu/Fe-based layered perovskites uncovered an unexpected knob to control the stability range of a magnetic spiral-chemical disorder-, which has been successfully employed to stabilize magnetic spiral phases at temperatures as high as 400 K. These unexpected observations, which are hard to conciliate with traditional magnetic frustration mechanisms, were recently rationalized in terms of an original, local frustration model that explicitly accounts for the presence of disorder. In this mini-review, we summarize the main experimental observations on Cu/Fe layered perovskites, which show excellent agreement with the predictions of this novel magnetic frustration mechanism. We also present different strategies aimed at exploiting these experimental and theoretical developments for the design of materials featuring magnetoelectric spirals stable up to temperatures high enough for daily-life applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1422398</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1422398</link>
        <title><![CDATA[Investigating the role of palladium electrical contacts in interactions with carbyne nanomaterial solid matter]]></title>
        <pubdate>2024-07-08T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Mariya Aleksandrova</author>
        <description><![CDATA[Introduction: Traps at the interface between carbyne and palladium nanocoatings, produced at different growth conditions, are explored by current-voltage characteristics, scanning electron microscopy and thermal stimulation of charges for evaluation of their nature. It was found that the Pd films can form an Ohmic contact with the carbyne at certain deposition conditions and such deviated from the Ohmic behavior according to the RF sputtering voltage. This growth parameter was found to affect the interfacial traps formation on the carbyne surface, which is important feature for the charge trapping and releasing properties for hydrogen isotopes in the context of the energy release applications.Methods, Results and Discussion: The sputtering voltages of 0.5 kV and 0.7 kV were found unsuitable for controlled trap formation. Based on the currentvoltage and thermally stimulated current (TSC) measurements, a sputtering voltage of 0.9 kV appeared to be more favorable compared to 0.5 kV and 0.7 kV. At 0.9 kV thermal activation of charge carriers are enabled at lower thermal energies, showing a distinct change in TSC behavior correlated to trap activation.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1430228</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1430228</link>
        <title><![CDATA[Editorial: Innovators in quantum materials]]></title>
        <pubdate>2024-06-25T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Xiaotian Wang</author><author>Vincent G. Harris</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2024.1365526</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2024.1365526</link>
        <title><![CDATA[Advances in highly hydrided palladium]]></title>
        <pubdate>2024-02-22T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Qianru Wang</author><author>Shengyuan Zhang</author><author>Jianping Guo</author><author>Ping Chen</author>
        <description><![CDATA[Palladium is a prototypical hydride-forming metal, which can accommodate a large volume of hydrogen through the formation of either interstitial or complex hydrides. Interstitial palladium hydrides, especially those with exceptionally high hydrogen loadings, have attracted considerable interest from the low-energy nuclear reaction (LENR) community, as they have been invoked to explain the anomalous nuclear effects related to the known but controversial Pons-Fleischmann experiment. Complex palladium hydrides also constitute a class of solid-state hydrides that present stoichiometric PdH2, PdH3, or PdH4 units within the crystal structure, but remain unexplored as far as the unusual H/Pd ratio is concerned. This minireview gives a brief introduction to these two types of solid-state palladium hydrides, with the hope of providing some information for materials development relevant to LENR research.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2023.1148979</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2023.1148979</link>
        <title><![CDATA[Ferroelectric tunnel junctions: current status and future prospect as a universal memory]]></title>
        <pubdate>2023-09-28T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Urvashi Sharma</author><author>Gulshan Kumar</author><author>Sachin Mishra</author><author>Reji Thomas</author>
        <description><![CDATA[The semiconductor industry is actively looking for an all-encompassing memory solution that incorporates the advantageous aspects of current technology. This features non-volatility, like that of Flash memory, high scalability, like that of both Dynamic Random Access Memory (DRAM) and Flash, quick operation, like that of Static RAM (SRAM), and durability, like that of both DRAM and SRAM. Ferroelectric thin films, which have electrically switchable bi-stable polarization, are one prospective technology that has the potential to revolutionize memory storage. However, due to difficulties with scalability and dependable industrial manufacturing, Ferro-Electric (FE) memory technology has not been able to effectively compete with DRAM and Flash. Research in this area has accelerated after the recent discovery of resistive switching in ferroelectric tunnel junctions (FTJs). For FTJs to be successful, it is important to overcome some obstacles, such as preserving bi-stability in ferroelectric thin films over the critical thickness. Additionally, the existence of interfacial layers, sometimes known as a “dead layer”, between the electrode and the film can affect its characteristics. The article gives an overview of semiconductor memories with an emphasis on emerging technologies having the potential for future applications. It then goes into detail on the benefits of FTJ and its non-destructive reading capacity. The article also discusses the potential uses for FTJs in resistive switching while acknowledging their drawbacks and constraints.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2023.1179651</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2023.1179651</link>
        <title><![CDATA[Observation of linear magnetoelectric effect in a Dirac magnon antiferromagnet Cu3TeO6]]></title>
        <pubdate>2023-05-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Aga Shahee</author><author>Kyongjun Yoo</author><author>B. Koteswararao</author><author>N. V. Ter-Oganessian</author><author>Kee Hoon Kim</author>
        <description><![CDATA[Cu3TeO6, a three-dimensional antiferromagnet forming a unique spin-web lattice of spin-1/2 Cu2+ ions below the Néel temperature TN ≈ 62 K, has recently been found to exhibit topological Dirac or nodal magnon dispersion. In this study, we report the discovery of the linear magnetoelectric (ME) effects in Cu3TeO6 below TN. Our pyroelectric current measurements at a constant magnetic field (H) reveal a linear increase of electric polarization (P) with H for both P//H and P⊥ H configurations; a maximum P//[110] = 20 µC/m2 is obtained at µ0H//11¯0 = 14 T, corresponding to a linear ME coefficient 1.8 ps/m. Magnetic point group analysis and Monte-Carlo simulations confirm that finite linear ME coefficients are allowed in the off-diagonal and diagonal ME tensor components, consistent with the magnetic point group of 3¯′. As the parity-time symmetry can be broken in the presence of H or electric field E in the linear ME materials, we envisage that Cu3TeO6 should exhibit a H- or E-induced transformation in the topological magnon dispersion from a Dirac point/nodal line type into two Weyl point types.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2022.1050600</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2022.1050600</link>
        <title><![CDATA[Testing the validity of the core-shell-surface layer model on the size dependence of effective magnetic anisotropy in magnetic nanoparticles]]></title>
        <pubdate>2022-11-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Sobhit Singh</author><author>Mohindar S. Seehra</author>
        <description><![CDATA[The stability of the stored information in magnetic recording media depends on the anisotropy energy Ea (=KeffV) of nanoparticles (NPs) of volume V or diameter D. Therefore, it is important to know how the effective anisotropy constant Keff varies with size D of the NPs. In a recent paper [Appl. Phys. Lett. 110, 222409 (2017)], the observed Keff versus D variation in NPs of maghemite (γ-Fe2O3) was explained on the basis of the core-shell-surface layer (CSSL) model given by Eq.: Keff = Kb + (6KS/D) +Ksh{[1-(2d/D)]−3–1}, where Kb,KS, and Ksh are the anisotropy constants of spins in the core, surface layer, and a shell of thickness d, respectively. This CSSL model is an extension of an earlier core-surface layer (CSL) model described by Keff = Kb + (6KS/D) [Phys. Rev. Lett. 72, 282 (1994)] proposed to explain the Keff versus D variation in Fe NPs. For the NPs of γ-Fe2O3, the additional term of the CSSL model involving Ksh was found to be necessary to fit the data for sizes D < 5 nm. In this paper, we report the validity of the CSSL model for NPs of several other systems viz. Co, Ni, NiO, and Fe3O4 using the available data from literature. In selecting the data, care was taken to consider data only for non-interacting NPs since the interparticle interactions generally overshadow the actual value of Keff in NPs. It is shown that the new CSSL model describes very well the Keff vs. D variation for all particle sizes whereas the CSL model fails for smaller particles with the notable exception of Fe NPs. This validation of the CSSL model for the NPs of Co, Ni, NiO, Fe3O4, and γ-Fe2O3 suggests its general validity for magnetic NPs. Discussion is also presented on the comparative magnitudes of the parameters Kb, KS, and Ksh obtained from the fits to the CSSL model.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2022.963775</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2022.963775</link>
        <title><![CDATA[Solvothermal growth of moiré superlattices in antimony telluride spiral-type nanoplates]]></title>
        <pubdate>2022-10-20T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Robert Link</author><author>Gabriel Marcus</author><author>David Carroll</author>
        <description><![CDATA[The study of moiré superlattices (MSLs) has surged in recent years, as they have been found to host several emergent quantum phenomena associated with high electron correlations. In this study, we put forward a viable chemical route to the formation of moiré patterns in antimony telluride (Sb2Te3) nanoplates by leveraging screw dislocation-driven growth. These Sb2Te3 MSLs are synthesized using a scalable, one-pot, colloidal solution-liquid-solid (SLS) procedure. We report twist angles up to 0.52° (estimated using a combination of transmission electron microscope (TEM) image analysis and computer simulation). We investigate the early growth stages of Sb2Te3 spiral-type nanoplates under TEM, and we detail the growth of Sb2Te3 spiral-type nanoplates that feature a central nanopore, caused by tandem growth with nanorods. We hope that these methods will facilitate future investigation into the electronic properties of Sb2Te3 MSLs.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2022.977595</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2022.977595</link>
        <title><![CDATA[Topological states in boron phosphide with zinc-blende structure]]></title>
        <pubdate>2022-09-20T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Yang Li</author>
        <description><![CDATA[The field of topological states in phonon of solids have been rapidly developing in recent years. This work examined the phonon dispersion of a compound Boron Phosphide (BP) with a Zinc-Blende structure via first-principle calculation. The results show that BP is a stable compound in theory and hosts rich topological signatures in its phonon dispersion. Specifically, Weyl and quadratic nodal line states can be found in the acoustic branches, and triple point and quadratic contact triple point can be found in the optical branches. It is hoped that the rich topological states in BP can be imaged by inelastic x-ray scattering or neutron scattering in the near future.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2022.909344</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2022.909344</link>
        <title><![CDATA[Tunable Topological Phase Transition in Two-Dimensional Ternary Transition Metal Halides TiXI (X = P and As)]]></title>
        <pubdate>2022-07-22T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Peng-Jen Chen</author>
        <description><![CDATA[With first-principles calculations we predict tunable topological phase transition in two-dimensional (2D) ternary transition metal halides α-TiXI (X = P and As) via strain engineering. Besides, changing the number of stacking layers or van der Waals interlayer spacing can also result in topological phase transition in few-layer TiXI. The on-site Coulomb U of Ti atoms is neither tunable nor empirical in this work. Instead, it is evaluated by the density functional perturbation theory and hence the results are more accurate. The tunable topological phase of 2D α-TiXI via strain engineering makes them promising in spintronics devices that exploit quantum spin Hall effect. Furthermore, the topological edge states of the single-layer TiAsI exhibit interesting feature. They do not cross at the time-reversal invariant momenta (TRIM) where the band inversion occurs. Instead, they extend over the whole one-dimensional Brillouin zone and cross at the other TRIM. While all requirements of Z2 topological phase are fulfilled, it is rare especially for those with direct gap. The linear bulk bands around and at Γ point may be the reason for the unusual crossing.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fmats.2022.956349</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fmats.2022.956349</link>
        <title><![CDATA[Electric-Field Control of Magnetoresistance Behavior in a Conetic Alloy Thin Film/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 Multiferroic Heterostructure]]></title>
        <pubdate>2022-07-07T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Cangmin Wang</author><author>Wenyu Huang</author><author>Chi Wang</author><author>Lu Li</author><author>Chong Wei</author><author>Yuchen Sun</author><author>Weifeng Ge</author><author>Xiaoli Mao</author><author>Qiang Li</author><author>Yuanjun Yang</author><author>Cheng Jia</author><author>Hui Zhang</author><author>Zhenlin Luo</author><author>Chen Gao</author>
        <description><![CDATA[In this work, we investigate the influence of electric fields (E-fields) on the room-temperature magnetotransport behavior of an artificial multiferroic heterostructure, a Conetic alloy (Ni77Fe14Cu5Mo4) thin film/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (011). When the external magnetic field is parallel to the applied current, the switching field increases from 0.8 to 3.3 Oe at 0 and 8 kV/cm, respectively, and the corresponding magnetoresistance (MR) ratio at 20 Oe respectively decreases from 0.14% to 0.03% at 0 and 8 kV/cm. However, when the external magnetic field is perpendicular to the current, the switching field decreases from 10.1 to 1.7 Oe at 0 and 8 kV/cm, and the MR ratio in such a case decreases from −0.001% to −0.10%, respectively. Consequently, under the parallel and perpendicular modes, the tunabilities of the switching field are approximately +313% and −83%, and the MR ratio tunabilities under E-fields are approximately −79% and +9,900%, respectively. Such a large and anisotropic tunability of both the switching field and MR ratio is attributed to the ultrasoft magnetic property of the Conetic alloy thin film and anisotropic in-plane strain-mediated magnetoelectric coupling. However, the anisotropic MR ratio is approximately 0.15% and does not vary with the applied E-fields owing to the intrinsic property of Conetic thin films using transfer and circle transfer curve measurements, rather than the magnetization rotation caused by E-field-induced magnetoelastic anisotropy. This work demonstrates that multiferroic heterostructures with electrically tunable MR show considerable potential in designing energy-efficient electronic and spintronic devices.]]></description>
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