Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session Correlated Electrons 1

TT 17.14: Poster

Monday, March 16, 2020, 15:00–19:00, P2/EG

Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe₂ — •K. M. Ranjith¹, S. Luther^2,3, T. Reimann², B. Schmidt¹, Ph. Schlender⁴, J. Sichelschmidt¹, H. Yasuoka¹, A. M. Strydom⁵, Y. Skourski², J. Wosnitza^2,3, 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.