Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 22: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)

MA 22.4: Talk

Tuesday, March 17, 2020, 10:15–10:30, HSZ 304

Spin orbit entangled J=1/2 triangular magnets NaYbCh₂ (Ch:O,S,Se): pushing a spin liquid into criticality and magnetic order by magnetic fields — •M. Baenitz¹, K.M. Ranjith¹, S. Luther³, Ph. Schlender², T. Reimann³, S. Khim¹, J. Sichelschmidt¹, B. Schmidt¹, H. Yasuoka¹, H. Kuehne³, J. Wosnitza³, and Th. Doert² — ¹MPI for Chemical Physics of Solids, D-01187 Dresden, Germany — ²TU Dresden, Department of Chemistry and Food Chemistry, D-01062 Dresden, Germany — ³Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D- 01328 Dresden, Germany

Spin orbit coupling (SOC) brought significant progress to the field of quantum spin liquids (QSLs). Yb-based magnets are prime candidates for the QSL-state and as such the NaYbCh₂ series is regarded as a unique platform to study anisotropic planar spin 1/2 triangular lattice magnetism (TLM) with bond frustration. In contrast to YbMgGaO₄,which shares the same space group (R-3m), NaYbCh₂ lacks inherent lattice distortions and Yb resides on a centrosymmetric position in the YbCh₆ octahedron. Our comprehensive study combines bulk- and local- probes and identifies NaYbCh₂ as a new class of spin orbit entangled TLMs were the QSL state is realized on a perfect triangular lattice [1,2]. The application of fields in (a,b)-plane transforms the system into a critical regime followed by long range order. We present magnetization, specific heat and Na NMR data down to 300 mK

[1] M. Baenitz et al., Phys. Rev. B 98 (2018)

[2] K.M. Ranjith et al., Phys. Rev. B 99 (2019)