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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.23: Poster

Thursday, March 30, 2023, 14:00–16:00, P2/EG

Magnetoelastic Coupling, Grüneisen Scaling and Magnetic Phase Diagram of the Kitaev Material Na2Co2TeO6 — •Marius Säubert1, Jan Arneth1, Kwang-Yong Choi2, and Rüdiger Klingeler11Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Department of Physics, Sungkyunkwan University, Republic of Korea

We report high-resolution thermal expansion and magnetostriction measurements on the Kitaev candidate material Na2Co2TeO6 down to low temperatures and up to high magnetic fields. Our data enable us to quantify magnetoelastic coupling and identify dominant energy scales by means of Grüneisen analysis. Combined magnetisation and magnetostriction studies reveal a hitherto unreported, field-induced crossover for B||c accompanied by a sign change of ∂ TN/∂ B. For magnetic fields applied parallel to the honeycomb planes, magnetostriction shows that the anomaly in magnetisation at BC ≃ 6 T, which has recently been speculated to mark the onset of magnetic disorder, is connected to discontinuous lattice changes. Finally, our dilatometric studies allow us to construct the magnetic phase diagram of Na2Co2TeO6 which displays strong hysteresis at low temperatures.

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