Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.19: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster E
Magnetic dilution of a frustrated triangular-lattice spin system — •S. Luther1, F. Bärtl1,2, E. Häußler3, T. Doert3, J. Sichelschmidt4, T. Kotte1, J. Wosnitza1,2, M. Baenitz4, and H. Kühne1 — 1Hochfeld-Magnetlabor Dresden, HZDR — 2Institut für Festkörper- und Materialphysik, TU Dresden — 3Fakultät für Chemie und Lebensmittelchemie, TU Dresden — 4MPI-CPfS, Dresden
Among the Yb-based triangular-lattice antiferromagnets, the delafossite NaYbS2 is one of the candidates for realizing a quantum-spin-liquid (QSL) ground state. The magnetic phase diagram was probed by several experimental methods. The proposed QSL ground state of NaYbS2 is suppressed at fields of several tesla, and long-range order with various spin configurations is manifested. As a next step, we investigated possible changes to this phenomenology by diluting the magnetic lattice of NaYbS2 by means of Lu substitution. We synthesized a series of NaYb1−xLuxS2 single crystals, with 0 ≤ x ≤ 1, and characterized these crystals by various probes, where the ESR spectroscopy data reveal a systematic reduction of the Weiss temperature as x is increased [1]. Further, we present recent specific-heat, magnetization and NMR measurements for samples with x = 0.2, which reveal a reduction of the transition temperature to the field-induced long-range magnetic order. An unchanged enhancement of the nuclear spin-lattice relaxation rate 1/T1 at low fields and temperatures indicates the stability of the putative QSL ground state against small levels of magnetic dilution.
[1] E. Häußler et al., Phys. Rev. Mater. 6, 046201 (2022)
Keywords: triangular lattice; quantum spin liquid; delafossite; NMR; magnetization