SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.77: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Elementary magnetic excitations in epitaxial strained Sr₂IrO₄ thin films probed by resonant inelastic X-ray scattering — •Herman Muzychko^1,2, Monika Scheufele^1,2, Dan Mannix^3,4, Stephan Geprägs¹, and Rudolf Gross^1,2,5 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Technical University of Munich, TUM School of Natural Sciences, Physics Department, Garching, Germany — ³European Spallation Source, Lund, Sweden — ⁴Institut Néel, CNRS, Grenoble, France — ⁵Munich Center for Quantum Science and Technology (MCQST), Munich, Germany

The Ruddlesden-Popper series Sr_n+1Ir_nO_3n+1 has attracted considerable scientific attention due to the possibility of generating new physics properties within a strong spin-orbit coupling regime. In the first member of the series, the layered Sr₂IrO₄ (SIO) compound, the large spin-orbit coupling combined with a moderate Coulomb repulsion results in a Mott insulating J_eff = 1/2-ground state, which is similar to the S = 1/2-ground state of high-T_c superconducting Cu oxides. By performing resonant inelastic X-ray scattering (RIXS) experiments, we have investigated the elementary magnetic excitations in epitaxial strained-SIO thin films. The thus obtained spin wave dispersions have been simulated within the linear-spin wave theory by using the program package SpinW. With this, we are able to resolve the effect of epitaxial strain [1] on the elementary magnetic excitations in SIO by comparing our results to bulk SIO spin wave properties.
[1] S. Geprägs et al., Phys. Rev. B 102, 214402 (2020).