Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Frustrated Magnets II (joint session MA/TT)
MA 31.2: Vortrag
Mittwoch, 11. März 2026, 09:45–10:00, POT/0361
Magnetic resonance experiments on the quantum spin liquid candidate YbCuSe2 — Madhurima Biswas1, •Marlis Schuller3, Khokan Bhattacharya1, Yoshifumi Tokiwa2, Mamoun Hemmida3, Hans-Albrecht Krug von Nidda3, Norbert Büttgen3, István Kézsmárki3, and Mayukh Majumder1 — 1Department of Physics, Shiv Nadar Institution of Eminence, IN — 2Advanced Science Research Center, Japan Atomic Energy Agency, JPN — 3EPV, Institut of Physics, University of Augsburg, DE
Frustrated magnetism in triangular-lattice delafossites offers a fertile route to realising quantum spin liquids (QSL) beyond conventional ordered phases. Among these materials a new candidate, YbCuSe2, stands out as a QSL candidate from the present study. Magnetisation and ESR measurements on high-quality single crystals of YbCuSe2 reveal easy-plane anisotropy. Furthermore, heat-capacity measurements down to 400 mK and µSR measurements down to 30 mK show no signatures of long-range magnetic ordering, establishing this compound as a promising QSL candidate. To probe the low-energy spin dynamics, we performed 63Cu (I=3/2) NMR measurements down to 20 mK. We document in-plane and out-of-plane spin-lattice relaxation T1 as a function of temperature in an applied field of approximately 4 T. A dynamical phase separation was observed below 0.7 K, where one phase corresponds to the disorder-induced state, whereas the temperature evolution of the relaxation rate of the other phase exhibits a power-law divergence indicative of some quantum-critical spin fluctuations due to the proximity to a field-induced ordered state.
Keywords: Quantum Spin Liquids; Magnetic Resonance; Kitaev interaction; 4f Delafossites