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arXiv · 1905.12367

Lattice dynamics and phase stability of rhombohedral antimony under high pressure

Arianna Minelli·Sofia Michaela Souliou·Tra Nguyen-Thanh·Aldo Humberto Romero·Jorge Serrano·Wilfredo Ibarra Hernandez·Matthieu J. Verstraete·Vladimir Dmitriev·Alexei Bosak
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Abstract

The high pressure lattice dynamics of rhombohedral antimony have been studied by a combination of diffuse scattering and inelastic x-ray scattering. The evolution of the phonon behavior as function of pressure was analyzed by means of two theoretical approaches: density functional perturbation theory and symmetry-based phenomenological phase transition analysis. This paper focuses on the first structural phase transition, SbI-SbIV, and the role of vibrations in leading the transition. The phonon dispersion exhibits complex behaviour as one approaches the structural transition, with the branches, corresponding to the two transitions happening at high pressure in the Va elements (A7-to-BCC and A7-to-PC) both showing softening.

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Arianna Minelli, Sofia Michaela Souliou, Tra Nguyen-Thanh, Aldo Humberto Romero, Jorge Serrano, Wilfredo Ibarra Hernandez, Matthieu J. Verstraete, Vladimir Dmitriev, Alexei Bosak. 2019-05-06. Lattice dynamics and phase stability of rhombohedral antimony under high pressure. https://doi.org/10.1103/physrevb.100.104305

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