Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)

TT 24.4: Vortrag

Dienstag, 17. März 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. Doert21MPI 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)

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