SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 52: Frustrated Magnets: Strong Spin-Orbit Coupling
TT 52.3: Vortrag
Donnerstag, 30. März 2023, 15:30–15:45, HSZ 201
Spin-phonon dynamics in α-RuCl3 probed by ultrasound — •Andreas Hauspurg1,2, S. Zherlitsyn1, T. Helm1, V. Tsurkan3, K. Y. Choi4, S. H. Do5, W. Brenig6, N. Perkins7, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Institute of Physics, University of Augsburg, Germany — 4Department of Physics, Sungkyunkwan University, Republic of Korea — 5Oak Ridge National Lab, USA — 6Institute for Theoretical Physics, TU Braunschweig, Germany — 7School of Physics and Astronomy, University of Minnesota, USA
Among the most studied honeycomb-lattice materials predicted to host Kitaev interactions is the spin-orbit-coupled Mott insulator α-RuCl3. Despite antiferromagnetic ordering at 7 K, α-RuCl3 is considered proximate to the Kitaev quantum spin liquid (QSL) state, which features fractionalized quasiparticle excitations. A promising approach to study such excitations is to investigate the spin-phonon interaction in this material. Our studies of the elastic properties of α-RuCl3 by means of ultrasound pulse-echo technique indicate unconventional physics of the debated QSL phase. Here, we present low-temperature results of the sound velocity and attenuation in external magnetic fields and discuss their behavior with respect to the quasiparticle excitations in α-RuCl3. In our studies we observed a linear temperature dependence of the attenuation beyond the ordered state at 8 T that follows a characteristic C6 symmetry. Anomalies in the acoustic properties shed new light on the H-T phase diagram.