Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.2: Talk
Wednesday, March 19, 2025, 09:45–10:00, H33
Anisotropic magnetetoelastic coupling in Na3Co2SbO6 — •Prashanta K. Mukharjee1, Lichen Wang2, Anton Jesche1, Julian Kaiser1, Matthias Hepting2, Pascal Puphal2, Masahiko Isobe2, Bernhard Keimer2, Philipp Gegenwart1, and Alexander A. Tsirlin3 — 1Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany — 2Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany — 3Felix Bloch Institute for Solid-State Physics, University of Leipzig, 04103 Leipzig, Germany
Research on 3d-based Co2+ materials has intensified as they offer the potential to explore novel regimes of honeycomb magnets, including different versions of the extended Kitaev model. In this study, we investigate the thermodynamic properties of the Kitaev candidate Na3Co2SbO6 using complementary thermodynamic measurements, including magnetometry, calorimetry, and high-resolution dilatometry. Our results reveal significant in-plane lattice effects both in the zero-field magnetically ordered phase and in the field-induced states, highlighting a robust anisotropic spin-lattice coupling. Notably, we observe a sign change in both thermal expansion and the structural Grüneisen parameter, which points to a quantum critical endpoint. These findings shed new light on the critical behavior and spin-lattice interactions in Na3Co2SbO6 contributing to the understanding of its anisotropic magnetic behaviour.
Keywords: Kitaev model; Quantum critical point; Thermal expansion; Honeycomb lattice; Spin-lattice coupling