Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Frustrated Magnets - Spin Liquids - Experiments
TT 41.1: Vortrag
Dienstag, 13. März 2018, 10:15–10:30, H 3005
Yb- delafossites as pseudo spin 1/2 triangular magnets: magnetism, specific heat, NMR and the quest for spin liquids — •M. Baenitz1, K.M. Ranjith1, P. Schlender2, J. Sichelschmidt1, R. Sarkar3, S. Khim1, D.A. Sokolov1, H.H. Klauss3, H. Yasuoka1, A.P. Mackenzie1, D.S. Inosov3, and Th. Doert2 — 1MPI for Chemical Physics of Solids, 01187 Dresden, Germany — 2TU Dresden, Department of Chemistry and Food Chemistry, D-01062 Dresden, Germany — 3TU Dresden, Institute of Solid State Physics, D-01062 Dresden, Germany
S=1/2 triangular quantum magnets (TQM) are rare and discussed as ideal quantum spin liquids (QSL)[1]. Recently the pseudo S=1/2 TQM YbMgGaO4 was identified as a QSL candidate [2]. Delafossites share the same space group and the planar triangular spin arrangement so we started working on Yb based delafossites. These systems are rare (AYbO2 (A=Ag,Na)) and a low T pseudo spin S=1/2 state is in question. As for T-> 0 the magnetism of Yb compounds is determined by i)the crystalline electric field (CEF) and ii) the exchange frustration, replacing the oxygen by another chalcogen might tune the magnetism. NaYbS2, LiYbS2 and NaLuS2 were synthesized in poly- and single- crystalline form and bulk- (magnetization, specific heat) and local- methods (Na- Li- NMR, ESR, µ SR) were applied. Our studies evidence pseudo spin S=1/2 magnetism and an absence of magnetic order (T > 300 mK) which identifies (AM)YbS2 (AM=Li, Na) as a new promissing candidate for a QSL ground state.
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