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】
Free