Pressure-Induced Insulator-to-Metal Transition in van der Waals compound CoPS${}_3$

Abstract

We have studied the insulator-to-metal transition and crystal structure evolution under high pressure in the van der Waals compound CoPS${}_3$ through $\text{in-situ}$ electrical resistance, Hall resistance, magnetoresistance, X-ray diffraction, and Raman scattering measurements. CoPS${}_3$ exhibits a $C2/m$ $\to$ $P\overline{3}$ structural transformation at 7 GPa accompanied by a 2.9$\%$ reduction in the volume per formula unit. Concomitantly, the electrical resistance decreases significantly, and CoPS${}_3$ becomes metallic. This metallic CoPS${}_3$ is a hole-dominant conductor with multiple conduction bands. The linear magnetoresistance and the small volume collapse at the metallization suggest the incomplete high-spin $\to$ low-spin transition in the metallic phase. Thus, the metallic CoPS${}_3$ possibly possesses an inhomogeneous magnetic moment distribution and short-range magnetic ordering. This report summarizes the comprehensive phase diagram of $M$PS${}_3$ ($M$ = V, Mn, Fe, Co, Ni, and Cd) that metalize under pressures.

14 pages, 6 figures, 1 table

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Cited by in corpus (2)

• Sliding-mediated ferroelectric phase transition in CuInP2S6 under pressure
• Microscopic origin of local electric polarization in NiPS${}_3$