Dresden 2020 – wissenschaftliches Programm
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TT 17.14: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe2 — •K. M. Ranjith1, S. Luther2,3, T. Reimann2, B. Schmidt1, Ph. Schlender4, J. Sichelschmidt1, H. Yasuoka1, A. M. Strydom5, Y. Skourski2, J. Wosnitza2,3, H. Kühne2, Th. Doert4, and M. Baenitz1 — 1MPI for Chemical Physics of Solids, Dresden, Germany — 2Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 3Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 4Faculty of Chemistry and Food Chemistry, TU Dresden, Germany — 5Highly Correlated Matter Research Group, University of Johannesburg, South Africa
High-quality single crystals of NaYbSe2, which resembles a perfect triangular-lattice antiferromagnet without intrinsic disorder, are investigated by magnetization and specific-heat, as well as the local probe techniques nuclear magnetic resonance and electron spin resonance. The low-field measurements confirm the absence of any spin freezing or long-range magnetic order down to 50 mK, which suggests a quantum spin liquid ground (QSL) state with gapless excitations. An instability of the QSL state is observed upon applying magnetic fields. The absence of magnetic long-range order at zero fields is assigned to the effect of strong bond-frustration, arising from the complex spin-orbit entangled 4f ground state. Finally, we derive the highly anisotropic magnetic phase diagram, which is discussed in comparison with the existing theoretical models for spin-1/2 triangular-lattice antiferromagnets.