Influence of Cr-substitution on the structural, magnetic, electron transport, and mechanical properties of Fe3−Cr Ge Heusler alloys
- Award ID(s):
- 1726213
- Publication Date:
- NSF-PAR ID:
- 10235760
- Journal Name:
- Journal of Magnetism and Magnetic Materials
- Volume:
- 521
- Issue:
- P2
- Page Range or eLocation-ID:
- 167398
- ISSN:
- 0304-8853
- Sponsoring Org:
- National Science Foundation
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Low dimensional magnetism has been powerfully boosted as a promising candidate for numerous applications. The stability of the long-range magnetic order is directly dependent on the electronic structure and the relative strength of the competing magnetic exchange constants. Here, we report a comparative pressure-dependent theoretical and experimental study of the electronic structure and exchange interactions of two-dimensional ferromagnets CrBr 3 and Cr 2 Ge 2 Te 6 . While CrBr 3 is found to be a Mott–Hubbard-like insulator, Cr 2 Ge 2 Te 6 shows a charge-transfer character due to the broader character of the Te 5p bands at the Fermi level. This different electronic behaviour is responsible for the robust insulating state of CrBr 3 , in which the magnetic exchange constants evolve monotonically with pressure, and the proximity to a metal–insulator transition predicted for Cr 2 Ge 2 Te 6 , which causes a non-monotonic evolution of its magnetic ordering temperature. We provide a microscopic understanding for the pressure evolution of the magnetic properties of the two systems.