Role of sulfur in BaVS3 probed by S K-edge absorption spectroscopy

Vita Ilakovac (1, 2) , S. Boulfaat (2) , Yves Joly (3) , A.M. Flank (4) , P. Lagarde (4) , M. Žitnik (5) , M. Fialin (6) , H. Berger (7) , L. Forró (7)

1 UCP - Université de Cergy Pontoise
2 LCPMR - Laboratoire de Chimie Physique - Matière et Rayonnement
3 NEEL - SIN - Surfaces, Interfaces et Nanostructures
4 SSOLEIL - Synchrotron SOLEIL
5 IJS - Jozef Stefan Institute [Ljubljana]
6 Plateforme Camparis - Plateforme analytique MEN (Microanalyses en sciences de l’Environnement) [Paris]
7 ICPM

We show that the quasi-1D behavior of BaVS 3 can be understood analyzing the X-ray absorption near edge spectra at the sulfur K edge. Linear dichrosm experiments, analyzed with the help of ab initio calculations, reveal two strong and polarization dependent pre-edge features, induced by the band character of the 3d vanadium levels. They are related to crystal field split t 2g and e g states. When the temperature is lowered, the t 2g feature shifts progressively to higher energy, and its intensity increases for the polarization along the c-axis, stacking direction of the V-S face sharing octahedra. This behavior points to the depletion of sulfur states and thus the lack of S 3p -V 3d hybridization in the direction of V-S chains.

Mots clés: Metal-insulator transitions and other electronic transitions; X-ray absorption spectroscopy; Charge-density-wave system

Domaines: Physique [physics]; Matière Condensée [cond-mat]

Vita Ilakovac, S. Boulfaat, Yves Joly, A.M. Flank, P. Lagarde, et al.. Role of sulfur in BaVS3 probed by S K-edge absorption spectroscopy. Physica B: Condensed Matter, 2015, 460, pp.191-195. ⟨10.1016/j.physb.2014.11.067⟩. ⟨hal-01095456⟩