Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Physics of the van der Waals Magnetic Semiconductor CrSBr II (joint session HL/MA)

HL 60.2: Hauptvortrag

Freitag, 21. März 2025, 10:00–10:30, H17

Tuning the structure and magnetism in CrSBr via external pressure — •Ece Uykur — Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, 01328 Dresden, Germany

As one of the two-dimensional (2D) van der Waals (vdW) magnets, CrSBr regained significant attention recently because it is air-stable even in the monolayer form making this compound very attractive. It shows strong coupling between its magnetic, electronic, structural, and optical properties [1]. Several ab initio calculations put forward the importance of the balance between Cr-Cr direct exchange and Cr-anion-Cr superexchange interactions and showed that the A-type antiferromagnetism in this compound is delicately balanced with these short- and long-range magnetic interactions [2]. Therefore, studies exploring the tunability of the inter- and inralayer coupling are important and one plausible experimental strategy is the external pressure.

In this talk, I will summarize our recent efforts on high-pressure single crystal XRD and magnetization studies on CrSBr. We performed single crystal XRD studies up to ∼20 GPa, which reveals a non-monotonous behavior of Cr-ion in the structure along with a structural phase transition above 17 GPa. The movement of this Cr-ion has also direct link with the magnetization of the compound that is studied with the high-pressure magnetic susceptibility measurements up to ∼8 GPa.

[1] K. Lin et al., ACS Nano 18, 2898 (2024) [2] J. Cenker et al., Nat. Nanotechnol. 17, 256 (2022).

Keywords: CrSBr; High pressure XRD; High pressure magnetization; van der Waals magnet