SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.2: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Magnetic dilution of a frustrated triangular-lattice spin system — •Florian Bärtl1,2, Ellen Häußler3, Thomas Doert3, Jörg Sichelschmidt4, Sven Luther1,2, Tommy Kotte1, Jochen Wosnitza1,2, Michael Baenitz4, and Hannes Kühne11Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden — 2Institut für Festkörper- und Materialphysik, TU Dresden — 3Fakultät für Chemie und Lebensmittelchemie, TU Dresden — 4Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden

Among the Yb-based triangular-lattice magnets, the delafossite NaYbS2 is one of the promising candidates for realizing a quantum-spin-liquid (QSL) ground state. The magnetic phase diagram was probed by several experimental methods, such as specific-heat, magnetization, and NMR measurements. 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. A series of NaYb1−xLuxS2 single crystals, with 0 ≤ x ≤ 1, were synthesized and characterized by various probes, including ESR spectroscopy. The ESR data reveal a systematic reduction of the Weiss temperature as x is increased. Further, we present recent specific-heat measurements for samples with x ≤ 0.5, which reveal a systematic suppression of the transition temperatures to long-range order in magnetic fields with increasing Lu substitution.
We acknowledge the support of the SFB 1143.

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