Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 9: INNOMAG e.V. Prizes 2022 (Diplom-/Master and Ph.D. Thesis)

MA 9.1: Talk

Monday, September 5, 2022, 15:00–15:20, H43

Magnetoelastic coupling and uniaxial pressure dependencies in the honeycomb quantum magnets CrI₃ and Na₂Co₂TeO₆ — •Jan Arneth¹, Martin Jonak¹, Mahmoud Abdel-Hafiez², Kwang-Yong Choi³, and Rüdiger Klingeler¹ — ¹Kirchhoff-Institute for Physics, Heidelberg University, Germany — ²Dep. of Physics and Astronomy, Uppsala University, Sweden — ³Dep. of Physics, Sungkyunkwan University, Republic of Korea

Due to their layered structure, competing magnetic interactions, and magnetic anisotropy, quasi-2D honeycomb systems are promising quantum materials featuring fundamentally and technologically relevant phenomena. Often, relevant materials are at the verge of the desired properties, and strain has been proven to be a tuning parameter. Strain engineering of the critical temperature in 2D ferromagnetic semiconductors such as CrI₃ [1] towards room temperature or driving the quantum magnet Na₂Co₂TeO₆ into the Kitaev spin-liquid phase are illustrative examples. The precise determination of uniaxial strain effects is hence a mandatory step towards new applications and phenomena. We report dilatometric studies on the honeycomb quantum magnets CrI₃ and Na₂Co₂TeO₆ at low temperatures and high magnetic fields. Our data enable us to quantify magnetoelastic coupling and the uniaxial pressure dependencies of the respective ordering temperatures. Additionally, the magnetic phase diagrams are constructed, including structural response of the surface phase in CrI₃ and signatures of competing degrees of freedom in Na₂Co₂TeO₆.

[1] J. Arneth et al., Phys. Rev. B 105, L060404 (2022)