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Title: Influence of Cr-substitution on the structural, magnetic, electron transport, and mechanical properties of Fe3−Cr Ge Heusler alloys
Authors:
; ; ; ; ; ; ; ; ; ; ;
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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  1. 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.