Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.15: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Low-temperature 23Na NMR on the spin liquid candidate NaYbO2 — •D. Dmytriieva1,2, K. M. Ranjith3, S. Khim3, H. Yasuoka3, J. Wosnitza1,2, M. Baenitz3, and H. Kühne1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Max Plank Insitute for Chemical Physics of Solids, Dresden, Germany
The planar Jeff = 1/2 triangular-lattice magnet NaYbO2 is a rare-earth chalcogenide with delafossite structure of the R3m space group. The antiferromagnetically coupled Yb3+ ions form perfect triangular layers, well-separated along the c-axis, designating NaYbO2 as a promising quantum spin-liquid candidate. The combination of strong spin-orbit coupling and crystal electric field results in an effective magnetic moment Jeff = 1/2 at low temperatures. We present a study of the low-temperature field-induced phase transition to long-range order, probed by 23Na nuclear magnetic resonance (NMR) spectroscopy and spin-lattice relaxation-rate measurements on a polycrystalline NaYbO2 sample. In contrast to the related spin-liquid candidate YbMgGaO4, exchange disorder is absent, which is further manifested by the narrow electron-spin resonance lines. A sharp maximum of the 23Na spin-lattice relaxation rate, as well as a minimum of the related stretching exponent, indicates the phase transition to long-range order in applied finite fields (µ0H > 1 T).