SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Focus Session: Entanglement as a Probe for Correlated Quantum Matter

TT 3.5: Vortrag

Montag, 27. September 2021, 15:30–15:45, H6

Angle-dependent thermodynamic measurements on α-RuCl₃ — •Sebastian Bachus¹, David Kaib², Anton Jesche¹, Yoshifumi Tokiwa¹, Vladimir Tsurkan¹, Alois Loidl¹, Stephen Winter², Alexander Tsirlin¹, Roser Valentí², and Philipp Gegenwart¹ — ¹Center for Electronic Correlations and Magnetism, University of Augsburg — ²Institute of Theoretical Physics, Goethe University Frankfurt

For several years, the field-dependence of the Kitaev material α-RuCl₃ has been subject to controversial discussions. Recently, a field-induced Kitaev spin liquid state has been proposed above the critical field for long-range magnetic order. This scenario, however, requires another phase transition towards the partially polarized state upon leaving the spin liquid phase. We utilize a high-resolution alternating field method to precisely determine the magnetic Grüneisen parameter down to 0.5 K in magnetic fields up to 14 T. In combination with specific heat measurements, this allows us to determine the entropy evolution into and out of the presumed topological Kitaev quantum spin liquid regime. We compare our thermodynamic measurements to exact diagonalization results and carefully establish the temperature-field phase diagram. Finally, we discuss implications on the suggested spin liquid phase.
[1] S. Bachus et al., Phys. Rev. B 103, 054440 (2021)
[2] S. Bachus et al., Phys. Rev. Lett. 125, 097203 (2020)