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 35.5: 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 Isaeva1,5, Thomas Doert5, Randirley Beltrán Rodríguez6, Rajyavardhan Ray6, Silvina P. Limandri7, Maria Roslova5, Liviu Hozoi6, Ravi Yadav6, Jeroen van den Brink6,8, Gaël Bastien6, Anja U.B. Wolter6, Bernd Büchner1,6, and Jochen Geck11IFMP, 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 TN= 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.

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