Electron Correlations, Spin-Orbit Coupling, and Antiferromagnetic Anisotropy in Layered Perovskite Iridates Sr2IrO4

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 81-88
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/0253-6102/70/1/81

摘要

The effects of electron correlations and spin-orbit coupling on the magnetic anisotropy in the antiferromag-netically ordered 5d perovskite iridates Sr2IrO4 is investigated theoretically using a microscopic model includes a realistic five-orbital tight-binding Hamiltonian,atomic spin-orbit coupling,and multi-orbital Hubbard interactions.Hartree-Fock approximation is applied to obtain the ground state properties with varying spin-orbit coupling and electron correlations.We demonstrate that the interplay between the atomic intraorbital Coulomb repulsion and the Hund's rule coupling leads to a remarkable variability of the resulting magnetic anisotropy at a constant nonzero spin-orbit coupling.At the same time,the preferred direction of the ordered antiferromagnetical moment remains unaltered upon changes in the strength of spin-orbit coupling.