期刊
PHYSICAL REVIEW B
卷 86, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.014430
关键词
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资金
- National Science Foundation [DMR-0548182]
- US Department of Energy [DE-SC0001878]
- Texas Advanced Computing Center
Using spin density functional theory with the Hubbard correction, we investigate the magnetic structure of strained LaCoO3. We show that beyond biaxial tensile strain of 2.5%, local magnetic moments originating from the high spin state of Co3+ emerge in a low spin Co3+ matrix. In contrast, we find that compressive strain is not able to stabilize a magnetic state due to geometric constraints. LaCoO3 accommodates tensile strain via spin-state disproportionation, resulting in an unusual sublattice structure. In tensile-strained LaCoO3, the first nearest-neighbor (n.n.) exchange coupling is ferromagnetic (FM), while the second n.n. interaction is stronger and antiferromagnetic (AFM). This unusual feature of the exchange parameters is qualitatively verified with a model superexchange calculation. Due to the competition between the FM and the AFM couplings in the system, we find that the most probable magnetic structure of tensile-strained LaCoO3 is a canted-spin structure, which may explain the relatively small observed magnetic moment of 0.7 mu B/Co3+.
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