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TT: Fachverband Tiefe Temperaturen

TT 49: Frustrated Magnets: Strong Spin-Orbit Coupling I

TT 49.10: Talk

Wednesday, March 20, 2024, 17:30–17:45, H 2053

Understanding the Hamiltonian of α-RuCl3 through Non-Linear Spin-Wave AnalysisJonas Habel1,2, Roderich Moessner3, and •Johannes Knolle1,2,41Technical University of Munich, Germany — 2Munich Center for Quantum Science and Technology, Germany — 3Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 4Blackett Laboratory London, UK

α-RuCl3 has attracted much attention recently due to its potential to host a Kitaev spin liquid at intermediate magnetic fields, whose stability crucially depends on the model Hamiltonian and its parameters. These parameters are commonly probed by performing inelastic neutron scattering (INS) in the high-field limit, where the magnetic moments are fully polarized and spin-wave excitations are well-defined, and subsequently fitting the observed INS intensity to a theoretical linear spin-wave prediction. However, experimental estimates vary widely, in particular for the Kitaev interaction, which is vital for a spin liquid phase. Our work aims to improve these estimates by incorporating non-linear spin-wave effects in the theoretical computations. Concretely, we investigate neutron scattering data for a three-dimensional multi-layer of α-RuCl3 using an augmented Kitaev-Heisenberg model. Preliminary results show that non-linear quantum interactions have a significant impact on the spin-wave spectrum and should not be neglected when fitting model parameters to INS data.

Keywords: Spin-Wave Theory; Inelastic Neutron Scattering; Kitaev-Heisenberg Model

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