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TT: Fachverband Tiefe Temperaturen

TT 4: Graphene, 2D and Twisted Materials

TT 4.8: Vortrag

Montag, 9. März 2026, 11:30–11:45, HSZ/0105

Unveiling structural transitions in the van der Waals multiferroic CuCrP₂S₆ under pressure and temperature — •Swarnamayee Mishra^1,3, Gaston Garbarino², Alexander Mistonov^1,3, Steven Gebel¹, and Jochen Geck^1,3 — ¹Institute for Solid State and Materials Physics, TU Dresden, Dresden, Germany — ²European Synchrotron Radiation Facility (ESRF), Grenoble, France — ³Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, Dresden, Germany

Two-dimensional (2D) crystals with strong in-plane covalent bonds and weak van der Waals interlayer interactions have garnered significant attention following the discovery of graphene and its remarkable properties. CuCrP₂S₆ (CCPS) is a promising 2D material exhibiting antiferromagnetic behavior due to the collective ordering of Cr3+ spins and antiferroelectric properties driven by Cu+ ion ordering. These ferroic properties arise from spin-orbit coupling associated with crystal symmetry breaking. Despite its potential, a detailed pressure-dependent crystallographic study of CCPS remains unexplored. In this work, high-resolution single crystal x-ray diffraction is employed to explore its response to variations in pressure and temperature. Our measurements reveal a clear pressure-driven change of lattice symmetry at low temperatures from monoclinic Pc to monoclinic C2/c, together with signatures of charge ordering that point to strong coupling between structure and electronic degrees of freedom. In addition, a pressure-induced reorientation of a structural modulation is found, shifting it from the ac plane at low pressure to the ab plane at higher pressure.

Keywords: van der Waals Materials; Multiferroicity; High-pressure single crystal XRD; Structural modulation