Pressure-Induced Phase Transitions in Germanium Telluride: Raman Signatures of Anharmonicity and Oxidation

Pawbake, Amit ; Bellin, Christophe ; Paulatto, Lorenzo ; Béneut, Keevin ; Biscaras, Johan ; Narayana, Chandrabhas ; Late, Dattatray J. ; Shukla, Abhay (2019) Pressure-Induced Phase Transitions in Germanium Telluride: Raman Signatures of Anharmonicity and Oxidation Physical Review Letters, 122 (14). ISSN 0031-9007

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Official URL: http://doi.org/10.1103/PhysRevLett.122.145701

Related URL: http://dx.doi.org/10.1103/PhysRevLett.122.145701

Abstract

Pressure-induced phase transitions in GeTe, a prototype phase change material, have been studied to date with diffraction which is not sensitive to anharmonicity-induced dynamical effects. GeTe is also prone to surface oxidation which may compromise surface sensitive measurements. These factors could be responsible for the lack of clarity about the phases and transitions intervening in the phase diagram of GeTe. We have used high-pressure Raman scattering and ab initio pseudopotential density functional calculations to unambiguously establish the high-pressure phase diagram and identify three phases up to 57 GPa, a low-pressure rhombohedral phase, an intermediate pressure cubic phase, and a high-pressure orthorhombic phase. We detect substantial broadening and softening of Raman modes at low pressure and identify the transition regions and possible intermediate phases.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:124177
Deposited On:08 Nov 2021 07:14
Last Modified:08 Nov 2021 07:14

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