Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Frustrated Magnets – Strong Spin-Orbit Coupling
TT 8.1: Vortrag
Montag, 5. September 2022, 17:15–17:30, H10
α-RuCl3 probed by ultrasound under hydrostatic pressure — •Andreas Hauspurg1,2, S. Zherlitsyn1, T. Helm1, T. Yanagisawa3, V. Tsurkan4, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Department of Physics, Hokkaido University, Sapporo, Japan — 4Institute of Physics, University of Augsburg, Germany
As a prime candidate for a quantum spin liquid (QSL) in the frame of the Kitaev model, is the honeycomb material α-RuCl3 of particular interest. Although α-RuCl3 exhibits antiferromagnetic order below 7 K, it is considered as proximate to the QSL. The QSL features fractionalized quasiparticle excitations. A promising approach to investigate such excitations is to study the coupling between fractionalized quasiparticles and phonons. This affects the attenuation coefficient and the sound velocity of ultrasound. Our recent studies of the elastic properties of α-RuCl3 show a promising path to unveil the unconventional physics of the debated QSL phase. Here, we present low-temperature results of the sound velocity and attenuation in external magnetic fields and under hydrostatic pressures. The observed anomalies in the acoustic properties and strong magnetoelastic couplings shed new light on the unconventional physics in this compound. At a pressure of 11.3 kbar the antiferromagnetic order is completely suppressed.