期刊
PHYSICAL REVIEW B
卷 91, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.054412
关键词
-
资金
- CEM, an NSF MRSEC [DMR-0820414, DMR-1420451]
- DOE BES [DE-FG02-07ER46423]
We show that the interplay of strong Hubbard interaction U and spin-orbit coupling lambda in systems with d(4) electronic configuration leads to several unusual magnetic phases. Most notably, we find that competition between superexchange and spin-orbit coupling leads to a phase transition from a nonmagnetic state predicted by atomic physics to a novel magnetic state in the large-U limit. We show that the local moment changes dramatically across this phase transition, challenging the conventional wisdom that local moments are robust against small perturbations in a Mott insulator. The Hund's coupling plays an important role in determining the nature of the magnetism. We identify candidate materials and present predictions for resonant x-ray scattering signatures of the unusual magnetism in d(4) Mott insulators.
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