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SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.57: Poster

Thursday, March 30, 2023, 14:00–16:00, P2/EG

Magnetoelastic coupling and uniaxial pressure dependencies of AFM ordering in 2D vdW M2P2S6(M=Ni & Fe) — •Kranthi Kumar Bestha1,2, Laura Teresa Corredor Bohorquez1, Vilmos Kocsis1, Sebastian Selter1, Saicharan Aswartham1, Bernd Buechner1,2, and Anja U. B. Wolter11Institute for Solid State Research, Leibniz IFW Dresden, 01069, Dresden, Germany — 2Institute of Solid State and Materials Physics and Wuerzburg-Dresden Cluster of Excellence ct.qmat, Technical University Dresden, 01062 Dresden, Germany

Two-dimensional van der Waals(vdW) magnets research has been intensified recently due to their myriad of applications. For these applications, an understanding of coupling of the mechanical degrees of freedom to electronic and magnetic order is crucial. In this work, we employed thermodynamic methods to study the magnetoelastic coupling in 2D vdW Fe2P2S6 and Ni2P2S6. These materials belong to the class of transition metal chalcogenophosphates(M2P2S6), with XXZ- and Ising type antiferromagnetic order respectively. M(T) and Cp(T) on single crystals confirm AFM ordering in both Fe2P2S6(TN=118 K) and Ni2P2S6(TN=158 K). Our thermal expansion studies demonstrate positive thermal expansion coefficient along the crystallographic stacking axis, with signatures of magnetoelastic coupling by the onset of magnetic order for both Fe2P2S6 and Ni2P2S6 single crystals. We estimated the uniaxial pressure dependence of antiferromagnetic ordering temperature from heat capacity and thermal expansion.

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