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TT: Fachverband Tiefe Temperaturen

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

TT 77.2: Talk

Thursday, March 21, 2024, 15:15–15:30, H 3025

Magnetism in Kitaev Quantum Spin Liquid Candidate RuBr3Tillmann Weinhold1, Chennan Wang2, Felix Seewald1, Vadim Grinenko3, Yoshinori Imai4, Fuki Sato4, Kenya Ohgushi4, Hans Henning Klauss1, and •Rajib Sarkar11Institute of Solid State and Materials Physics, TU Dresden, Germany — 2Laboratory for Muon Spin Spectroscopy, PSI, Villigen, Switzerland — 3Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China — 4Department of Physics, Graduate School of Science, Tohoku University, Sendai, Japan

We present muon spin rotation (µSR) studies showing that long-range magnetic order takes place in RuBr3 at ≈ 34  K. The observations of clear oscillations in the muon time spectra demonstrate the presence of well-defined internal fields at the muon sites. The magnetic ordering appears to be very robust and static suggesting a more conventional nature of magnetic ordering in the RuBr3 system at zero field. Present investigations prove that in RuBr3 the Kitaev interactions are likely to be weakened at zero field in comparison to the α-RuCl3 system. This proves that it is possible to tune the Kitaev interactions by replacing Cl with heavier halogen elements such as Br.

Keywords: RuBr3; Kitaev interactions; Muon; Spin liquid

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