Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 21: Frustrated Magnets I
MA 21.12: Talk
Wednesday, March 19, 2025, 12:30–12:45, H18
Understanding the Hamiltonian of α-RuCl3 through Nonlinear Spin-Wave Analysis — •Jonas Habel1,2, Roderich Moessner3 und Johannes Knolle1,2,4 — 1Technical 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
The precise values of the magnetic exchange couplings in α-RuCl3 are of significant interest to understand the proposed Kitaev spin-liquid phase. A common method for extracting them involves fully field-polarizing the magnetic moments, performing an inelastic neutron scattering (INS) experiment, and fitting a non-interacting (linear) spin-wave theory to the data. However, due to magnetic frustration, magnon many-body interactions are strong in α-RuCl3 and cannot be neglected, even at high fields. We present a procedure for fitting an interacting (nonlinear) spin-wave theory to INS data, explicitly accounting for these many-body interactions. This reveals a significant renormalization of the exchange couplings compared to linear spin-wave estimates.
Keywords: Magnon-magnon interactions; Kitaev; Many-body interactions; Neutron Scattering; Spin Liquid