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TT: Fachverband Tiefe Temperaturen
TT 24: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)
TT 24.3: Vortrag
Dienstag, 17. März 2020, 10:00–10:15, HSZ 304
NMR and bulk magnetometry investigations of the field-induced order in the frustrated triangular-lattice compound NaYbSe2 — •S. Luther1,2, K. M. Ranjith3, T. Reimann1, Ph. Schlender4, B. Schmidt3, J. Sichelschmidt3, H. Yasuoka3, J. Wosnitza1,2, Th. Doert4, M. Baenitz3, and H. Kühne1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3MPI for Chemical Physics of Solids, Dresden, Germany — 4Faculty of Chemistry and Food Chemistry, TU Dresden, Germany
The Yb-based delafossite NaYbSe2 is a triangular-lattice antiferromagnet with space group (R-3m). In this compound, spin-orbit coupling leads to a pronounced magnetic anisotropy. The absence of magnetic long-range order at zero field is suggestive of a quantum spin-liquid ground state. From specific-heat and magnetization experiments, magnetically ordered states were observed for H ⊥ c and H || c exceeding 2 and 9 T, respectively. 23Na (I = 3/2) NMR probes the microscopic details of the field-induced magnetic structure. Measurements of the 1/T1-relaxation rate are consistent with the specific-heat data. At H ⊥ c = 5 T, the magnetization indicates an up-up-down spin arrangement with according asymmetric broadening of the NMR spectra. At H || c = 16 T, an umbrella-type configuration of the magnetic moments is revealed, in agreement with a symmetric broadening of the NMR spectra. Low-field measurements reveal a continuous increase of the 1/T1-relaxation rate and spectral broadening without signatures of long-range order down to 0.3 K.