Anharmonic suppression of charge density waves in 2H-NbS2 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2012

Anharmonic suppression of charge density waves in 2H-NbS2

Résumé

The temperature dependence of the phonon spectrum in the superconducting transition-metal dichalcogenide 2H-NbS2 is measured by diffuse and inelastic x-ray scattering. A deep, wide, and strongly temperature-dependent softening of the two lowest-energy longitudinal phonon bands appears along the Gamma Msymmetry line in reciprocal space. In sharp contrast to the isoelectronic compound 2H-NbSe2, the soft phonons energies are finite, even at very low temperature, and no charge density wave instability occurs, in disagreement with harmonic ab initio calculations. We show that 2H-NbS2 is at the verge of the charge density wave transition and its occurrence is only suppressed by the large anharmonic effects. Moreover, the anharmonicity and the electron phonon coupling both show a strong in-plane anisotropy.
Fichier principal
Vignette du fichier
e155125.pdf (857.01 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00965628 , version 1 (25-03-2014)

Identifiants

Citer

Maxime Leroux, Mathieu Le Tacon, Matteo Calandra, Laurent Cario, Marie Aude Measson, et al.. Anharmonic suppression of charge density waves in 2H-NbS2. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 86 (15), pp.155125. ⟨10.1103/PhysRevB.86.155125⟩. ⟨hal-00965628⟩
508 Consultations
457 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More