SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Frustrated Magnets
TT 18.3: Vortrag
Donnerstag, 30. September 2021, 10:30–10:45, H7
Spin-orbit coupled Mott insulator, Sr2IrO4: spin and charge orders — •Mehdi Biderang1, Alireza Akbari2, and Jesko Sirker1 — 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2 — 2Max Planck Institute for the Chemical Physics of Solids, D-01187 Dresden, Germany
An antisymmetric spin-orbit coupling of a two-dimensional single-band Hubbard Hamiltonian is investigated. We propose that this is the most basic paradigm for understanding the electrical characteristics of locally noncentrosymmetric transition metal (TM) oxides like Sr2IrO4. Based on exact diagonalizations of small clusters and the random-phase approximation, we study the correlation effects on charge and magnetic order as a function of doping and of the TM-oxygen-TM bond angle. We see dominating commensurate in-plane antiferromagnetic fluctuations for low doping and small angles, whereas ferromagnetic fluctuations dominate for larger angles. Moderately strong nearest-neighbor Hubbard interactions can also stabilize a charge density wave order. We find good qualitative agreement between the dispersion of magnetic excitations in the hole-doped scenario and resonant inelastic x-ray scattering measurements.