Vibrational properties of delafossite CuGaO2 at ambient and high pressures. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2005

Vibrational properties of delafossite CuGaO2 at ambient and high pressures.

Résumé

In this paper we investigate the vibrational properties of CuGaO2 delafossite by means of Raman experiments and ab initio calculations. Both investigations have been performed at ambient pressure and also at high pressure. The two Raman-active modes have frequencies wEg=368±1 cm–1 and wA1g=729±1 cm–1, and pressure coefficients 2.78±0.03 cm–1/GPa (Eg) and 4.64±0.09 cm–1/GPa (A1g). Raman experiments indicate the existence of a phase transition beginning at 26±1 GPa. At about the same pressure, ab initio calculations show the presence of a dynamical instability, possibly related to the phase transition. The phonon dispersion curves are also discussed.
Fichier non déposé

Dates et versions

hal-00021413 , version 1 (21-03-2006)

Identifiants

Citer

J. Pellicer-Porres, A. Segura, E. Martínez, A.M. Saitta, A. Polian, et al.. Vibrational properties of delafossite CuGaO2 at ambient and high pressures.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 72, pp.064301 (1-6). ⟨10.1103/PhysRevB.72.064301⟩. ⟨hal-00021413⟩
63 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More