Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Electron Theory of Magnetism and Correlations (joint session MA/TT)

TT 21.2: Vortrag

Montag, 9. März 2026, 15:15–15:30, POT/0151

Near Room-Temperature Ferromagnetism and Insulator-Metal Transition in van der Waals Material CrGeTe₃ — Daniel Guterding¹, Jihaan Ebad-Allah², Gili Scharf³, Han-Xiang Xu⁴, Makoto Shimizu⁵, Junya Otsuki⁶, Alon Ron³, Christine Kuntscher², and •Harald O. Jeschke⁶ — ¹Technische Hochschule Brandenburg, Brandenburg an der Havel, Germany — ²Augsburg University, Augsburg, Germany — ³Tel Aviv University, Tel Aviv, Israel — ⁴Chinese Academy of Sciences, Beijing, China — ⁵Kyoto University, Kyoto, Japan — ⁶Research Institute for Interdisciplinary Science, Okayama University, Okayama, Japan

We investigate how pressure tunes the electronic and magnetic properties of the van der Waals ferromagnet CrGeTe₃, a promising material for near room-temperature applications. Using DFT+DMFT, we trace the transition from semiconducting to metallic ferromagnet [1]. Optical conductivity reveals a mid-infrared feature, signalling orbital-selective correlations, while a double-exchange mechanism stabilizes high-temperature ferromagnetism [2]. The anomalous Hall effect shows extrinsic behaviour beyond pure Berry curvature effects [3]. These results highlight the interplay of magnetism and electronic correlations in achieving tunable ferromagnetism in CrGeTe₃, suggesting that pressure and charge carrier doping offer promising routes to control magnetism and transport in layered materials.

[1] H.-X. Xu et al., Phys. Rev. B 108, 125142 (2023)
[2] J. Ebad-Allah et al., Phys. Rev. B 111, L140402 (2025)
[3] G. Scharf et al., Phys. Rev. Res. 7, 013127 (2025)

Keywords: ferromagnetism; van der Waals materials; double exchange; electronic correlations; high pressure