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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 RuBr₃ — Tillmann Weinhold¹, Chennan Wang², Felix Seewald¹, Vadim Grinenko³, Yoshinori Imai⁴, Fuki Sato⁴, Kenya Ohgushi⁴, Hans Henning Klauss¹, and •Rajib Sarkar¹ — ¹Institute 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