About this Research Topic
Noncentrosymmetric magnetic materials exhibit unusual magnetic properties such as multiferroics and magnetic skyrmions. On the other hand, materials in which the inversion symmetry is broken locally, like zigzag and honeycomb structures, are also expected to give rise to the emergence of magnetoelectric effects, exotic superconductivity and so on, originating from the antisymmetric spin-orbit coupling.
Recently, high-entropy alloys (HEAs) have attracted much attention as a new class of materials. HEAs usually contain at least five elements, with the atomic fraction of each element being 5% to 35% at one crystallographic site. Superconductivity is also one of the hot topics in this area since the discovery of HEA superconductors in 2014. The robust superconductivity under an extremely high pressure or against the atomic disorder originating from the large mixing entropy is a new finding.
Since the discovery of a heavy-fermion superconductor without inversion symmetry, CePt3Si, researchers working in strongly correlated electron systems have been exploring vigorously new materials without global or local inversion symmetry and novel magnetic properties. Recently, as a result, a magnetic skyrmion has been discovered in a localized 4f electron system EuPtSi.
The ever-reported HEA superconductors with the simple structures are restricted to body-centered-cubic and hexagonal-closed packing. These HEA superconductors are useful for the study of a relationship between crystalline and amorphous superconductors. The materials research on face-centered-cubic HEA superconductors is highly desired for a deep understanding of this relationship. Another recent progress is the discovery of superconducting HEAs with multiple crystallographic sites randomly occupied by several elements. Basic metallurgical research is therefore an important area. Besides this, a new synthesis route for HEA is interesting and desired. The materials research on HEA superconductors has just begun and will have unlimited possibilities of finding new phenomena. Moreover, magnetic HEAs have also attracted attention from researchers all over the world.
It is widely accepted that first principle calculations, machine learning and CALPHAD (calculation of phase diagram) are powerful methods for screening new compounds.
In this Research Topic, we wish to collect articles mainly concerning the cutting edge of materials research on magnetic materials without global or local inversion symmetry, odd-parity multipoles, and HEA superconductors. Both experimental and theoretical approaches are encouraged, and Review articles are also welcome. Furthermore, Original Research articles of materials research on HEA magnetic materials are welcome.
Topics of interest include but are not limited to:
· Magnetic materials without inversion symmetry
· High-entropy alloys (HEAs)
· Theoretical studies (first principle calculations, machine learning, CALPHAD, and so on)
Keywords: magnetism, superconductivity, no inversion symmetry, odd-parity multipoles, high-entropy alloys
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