SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.23: Poster

Donnerstag, 30. März 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 Klingeler¹ — ¹Kirchhoff 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 ∂ T_N/∂ B. For magnetic fields applied parallel to the honeycomb planes, magnetostriction shows that the anomaly in magnetisation at B_C ≃ 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.