Electronic structure and anomalous Hall effect in the ferromagnetic 3d-5d superlattice SrMnO3/SrIrO3

Article

关键词: BERRY-PHASE;    DOUBLE-EXCHANGE;    HYPERORBITS;    DYNAMICS;   

DOI  :  10.1103/PhysRevB.99.245145

来源: SCIE

【 摘 要 】

The electronic structure and the anomalous Hall effect (AHE) at the recently grown 3d-5d superlattice structure (SrMnO3)(1)/(SrIrO3)(1) are investigated theoretically using model and density-functional calculations. The observed ferromagnetism for the SMO layer, which becomes electron doped because of the charge transfer across the interface, is explained to be due to the Anderson-Hasegawa double exchange, while the SIO side becomes ferromagnetic due to the proximity effect and the Nagaoka physics of a hole-doped system. The broken time-reversal symmetry and the strong spin-orbit coupling in SIO provide the two essential ingredients for the AHE, which we describe within a square lattice model of d-orbitals relevant for the present structure. The model correctly predicts the order of magnitude of the anomalous Hall conductivity (AHC), which is computed using the Kubo formula. The density-functional results for the AHC are in good agreement with the experiments.

【 授权许可】

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