Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)
MA 22.5: Talk
Tuesday, March 17, 2020, 10:30–10:45, HSZ 304
Spin dynamics in the quantum spin liquid candidate Na2BaCo(PO4)2 probed by Electron Spin Resonance — •Christoph Wellm1,2, Willi Roscher1, Vladislav Kataev1, Oleg Janson1, Bernd Büchner1,2, Robert J. Cava3, and Ruidan Zhong3 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01069 — 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01062 — 3Department of Chemistry, Princeton University, Princeton, US-08544
The triangular-lattice magnet Na2BaCo(PO4)2 with localized effective spin-1/2 moments of Co2+ ions shows strong, exotic magnetic flucuations in absence of long-range order down to 0.3 K with large residual entropy and linear in temperature spinon excitations, making it a very promising candidate for the realization of a quantum spin liquid [1,2]. We report electron spin resonance (ESR) and magnetization results of powder and single crystals of the title compound supporting the scenario of a spin liquid. We relate our results to previous experimental studies [1,2] and theory (talk by W. Roscher et.al. at this conference).
[1] R. Zhong et al., Proc. Natl. Acad. Sci., 116, pp. 14505-14510 (2019)
[2] N. Li et al., arXiv:1911.11107 (2019)