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Pressure induced electronic and structural phase evolution in Van der Waals compound FePS$_3$

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Haines, CRS 
Coak, MJ 
Wildes, AR 
Lampronti, GI 


Two-dimensional materials have proven to be a prolific breeding ground of new and unstudied forms of magnetism and unusual metallic states, particularly when tuned between their insulating and metallic phases. In this paper we present work on a new metal to insulator transition system FePS3 . This compound is a two-dimensional van-der-Waals antiferromagnetic Mott insulator. Here we report the discovery of an insulator-metal transition in FePS3, as evidenced by x-ray diffraction and electrical transport measurements, using high pressure as a tuning parameter. Two structural phase transitions are observed in the x-ray diffraction data as a function of pressure and resistivity measurements show evidence of the onset of a metallic state at high pressures. We propose models for the two new structures that can successfully explain the x-ray diffraction patterns.



cond-mat.str-el, cond-mat.str-el

Journal Title

Physical Review Letters

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American Physical Society
EPSRC (1352654)
Engineering and Physical Sciences Research Council (EP/M000524/1)