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TT: Fachverband Tiefe Temperaturen

TT 77: Frustrated Magnets: Strong Spin-Orbit Coupling II

TT 77.4: Talk

Thursday, March 21, 2024, 15:45–16:00, H 3025

Pressure effect on several Kitaev materials — •Bin Shen¹, Faranak Bahrami², Fazel Tafti², Philipp Gegenwart¹, and Alexander A. Tsirlin³ — ¹EP VI, EKM, University of Augsburg, Germany — ²Department of Physics, Boston College, Chestnut Hill, MA 02467, USA — ³Felix Bloch Institute, University of Leipzig, Germany

Kitaev quantum spin liquids host quantum entanglement and non-Abelian anyonic excitations. However, experimentally, the ground state of these Kitaev candidates is all magnetically ordered mainly thanks to other competing interactions beyond pure Kitaev exchange. Boosting the Kitaev term and driving the system towards Kitaev limit is a subject of current interest. Here, we present our pressure-tuning results on several Kitaev materials [β-Li₂IrO₃ (B. Shen et al., PRB 104, 134426), α-Li₂IrO₃ (B. Shen et al., PRB 105, 054412), and α-RuBr₃ (unpublished)] and reveal a generic behavior for the majority: a sudden suppression of the magnetic order due to structural dimerization. We also show one exception [Ag₃LiRh₂O₆ (unpublished)] in which the magnetic order is gradually suppressed without the interference of structural dimerization.

Keywords: Kitaev spin liquid; magnetism; pressure