Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Correlated Magnetism – Frustrated Systems

TT 26.2: Vortrag

Mittwoch, 19. März 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