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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.
L.Savary et al., Rep. Prog. Phys. 80 (2017).
J.A.M. Paddison et al., Nature Phys. 13,(2017).