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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Magnetism – Spin Liquids I
TT 72.7: Vortrag
Donnerstag, 12. März 2026, 11:15–11:30, HSZ/0105
Low temperature thermodynamic studies on the Kitaev candidates Na2Co2TeO6 and Na3Co2SbO6 — •Sebastian Erdmann1, Prashanta Mukharjee1, Chanhyeon Lee2, Kwang-Yong Choi3, and Philipp Gegenwart1 — 1Experimental Physics VI, University of Augsburg, Germany — 2Department of Physics, Chung-Ang University, Republic of Korea — 3Department of Physics, Sungkyunkwan University, Republic of Korea
Cobalt-based honeycomb magnets have recently attracted considerable attention as a new class of materials that may host bond-directional Kitaev interactions [1].
Among these, Na2Co2TeO6 and Na3Co2SbO6 undergo antiferromagnetic ordering below 27 K and 5 K, respectively [2, 3].
We employed heat-capacity and magnetic Grüneisen parameter measurements to study the nature of the various low-temperature field-induced phase transitions, building on our previous work with the sister compound BaCo2(AsO4)2 [4].
The phase diagrams are extended to below 2 K and the entropy S(T,B) of the different field-induced phases is determined.
Our results provide new insights on proposed field-induced spin liquid states and reveal commonalities and distinctions of different prototype Kitaev candidate materials.
[1] H. Liu, G. Khaliullin, Phys. Rev. B 97, 014407 (2018).
[2] E. Lefrançois et al., Phys. Rev. B 94, 214416 (2016).
[3] J.-Q. Yan et al., Phys. Rev. Materials 3, 074405 (2019)
[4] Prashanta K. Mukharjee et al., Phys. Rev. B 110, L140407 (2024).
Keywords: honeycomb Kitaev systems; specific heat; magnetic Grüneisen parameter