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TT: Fachverband Tiefe Temperaturen

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

TT 35.5: Vortrag

Mittwoch, 18. März 2020, 10:45–11:00, HSZ 304

Pressure-induced dimerization and Kitaev spin liquid regime of α-RuCl₃ — •Quirin Stahl¹, Gaston Garbarino², Tobias Ritschel¹, Francisco J. Martinez-Casado³, Gilberto Fabbris⁴, Joerg Strempfer⁴, Maximilian Kusch¹, Anna Isaeva^1,5, Thomas Doert⁵, Randirley Beltrán Rodríguez⁶, Rajyavardhan Ray⁶, Silvina P. Limandri⁷, Maria Roslova⁵, Liviu Hozoi⁶, Ravi Yadav⁶, Jeroen van den Brink^6,8, Gaël Bastien⁶, Anja U.B. Wolter⁶, Bernd Büchner^1,6, and Jochen Geck¹ — ¹IFMP, TU Dresden, Germany — ²ESRF, Grenoble, France — ³ILL, Grenoble, France — ⁴APS, Argonne National Laboratory, USA — ⁵Faculty of Chemistry and Food Chemistry, TU Dresden, Germany — ⁶IFW Dresden, Germany — ⁷IFEG, National University of Córdoba, Argentina — ⁸Institute of Theoretical Physics, TU Dresden, Germany

Recently, the honeycomb material α-RuCl₃ has been identified as a possible realization of the Kitaev model, rendering this material an ideal platform for exploring Kitaev magnetism experimentally. However, the onset of long-range magnetic order at T_N= 7 K and ambient pressure, i.e. the absence of a spin liquid ground state, implies that α-RuCl₃ deviates from the ideal Kitaev model under these conditions. We therefore set out to elucidate whether α-RuCl₃ can be driven into the true Kitaev regime by means of hydrostatic pressure. Our x-ray diffraction and extended x-ray absorption fine structure studies reveal a rich structural phase diagram, including pressure induced Ru-Ru dimerization as well as a high-symmetry rhombohedral phase. The latter is indeed found to be very close to the ideal Kitaev model.