Pressure-induced electronic and isostructural phase transitions in PdPS: Raman, x-ray, and first-principles study

Gupta, SN and Singh, A and Sarkar, S and Muthu, DVS and Sampath, S and Waghmare, U and Sood, AK (2020) Pressure-induced electronic and isostructural phase transitions in PdPS: Raman, x-ray, and first-principles study. In: Physical Review B, 101 (3).

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Abstract

Application of pressure is known to be an effective tool for tuning structural and electronic properties of transition metal dichalcogenides. In this work we present evolution of PdPS with pressure using Raman spectroscopy and synchrotron x-ray diffraction up to 26 GPa, complemented with first-principles theoretical analysis of PdPS under pressure up to 36 GPa. Raman spectra reveal changes in the pressure derivatives of Raman frequencies at P�2, 11, and 21 GPa, suggesting three isostructural electronic phase transitions in PdPS. The pressure-dependent x-ray diffraction shows a sudden rise in the bulk modulus from 90±3 to 123±7 GPa occurring at P�11 GPa. Using first-principles density functional theory calculations, we demonstrate that the low-pressure phase transitions are associated with changes in direct band gap at � point while the high-pressure (at P=21 GPa) transition is associated with semiconductor to semimetal transition. From analysis of PdPS at higher pressures, we predict a structural phase transition in PdPS at P�32 GPa from orthorhombic to monoclinic structure.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society
Keywords:	Calculations; Density functional theory; Electronic properties; Energy gap; Palladium compounds; Raman spectroscopy; Sulfur compounds; Transition metals; X ray diffraction, Electronic phase transition; First-principles density functional theory; First-principles study; Monoclinic structures; Structural and electronic properties; Structural phase transition; Synchrotron x ray diffraction; Transition metal dichalcogenides, Phosphorus compounds
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Physical & Mathematical Sciences > Physics
Date Deposited:	03 Mar 2020 07:16
Last Modified:	03 Mar 2020 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/64523

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