Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: Correlated Magnetism – Frustrated Systems

TT 26.1: Talk

Wednesday, March 19, 2025, 09:30–09:45, H33

Temperature-magnetic field phase diagram of the honeycomb Kitaev system Na₂Co₂TeO₆ — •Sebastian Erdmann¹, Prashanta Mukharjee¹, Chanhyeon Lee², Kwang-Yong Choi³, and Philipp Gegenwart¹ — ¹Experimental Physics VI, University of Augsburg, Germany — ²Institute for Materials Research, Tohoku University, Japan — ³Department of Physics, Sungkyunkwan University, Republic of Korea

Co-based honeycomb magnets have recently attracted considerable interest as promising candidates for the realization of the bond-directional Kitaev exchange [1]. Na₂Co₂TeO₆ belongs to this class of materials and displays antiferromagnetic order below 27 K [2]. We investigate a series of phase transitions in Na₂Co₂TeO₆ below 4 K, induced by the application of magnetic fields along the a- and a^∗-axes. The H-T phase diagram is determined by low-temperature measurements of the specific heat and magnetic Grüneisen parameter, supplemented by literature results. We also compare the thermodynamic behavior upon field tuning to similar studies on other Kitaev materials, such as the prototype system α-RuCl₃.[3]
[1] H. Liu, G. Khaliullin, Phys. Rev. B 97, 014407 (2018).
[2] E. Lefrançois et al., Phys. Rev. B 94, 214416 (2016).
[3] S. Bachus et al., Phys. Rev. B B 103, 054440 (2021).

Keywords: honeycomb Kitaev systems; specific heat; magnetic Grüneisen parameter