Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Frustrated Magnets - Strong Spin-Orbit Coupling 1 (joint session TT/MA)

TT 35.4: Vortrag

Mittwoch, 18. März 2020, 10:30–10:45, HSZ 304

Pressure-dependent investigation of the elastic constants in α-RuCl₃ — •A. Hauspurg^1,2, S. Zherlitsyn¹, T. Yanagisawa³, V. Felea¹, V. Tsurkan⁴, K.-Y. Choi⁵, S.-H. Do⁵, and J. Wosnitza^1,2 — 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 — ⁵Department of Physics, Chung-Ang University, Seoul, South Korea

As a paradigmatic example of the realization of Kitaev physics on a honeycomb lattice, α-RuCl₃ serves for numerous experimental investigations of fundamental physics of this model. Yet it shows a striped AF groundstate with evidence for a field-induced quantum spin liquid state. We performed investigations of the elastic constants by means of propagating ultrasound waves in this intriguing compound. Under variable magnetic fields, temperatures, and pressures we obtain further insight into its phase diagram. We will show evidence of pressure-dependent contributions of competing Kitaev and Heisenberg terms, which results in a suppression of the antiferromagnetically ordered phase at low temperatures.