Random alloy-like local structure of Fe(Se, S) 1− x Te x superconductors revealed by extended x-ray absorption fine structure - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2011

Random alloy-like local structure of Fe(Se, S) 1− x Te x superconductors revealed by extended x-ray absorption fine structure

Résumé

The local structure of Fe(Se, S) 1− x Te x ternary (11-type) chalcogenides has been studied by temperature dependent Fe K-edge extended x-ray absorption fine structure measurements. We find that the Fe-Se and Fe-Te distances in ternary FeSe 1− x Te x are closer to the respective distances in the binary systems, revealing significant divergence of the local structure from the average one. The mean square relative displacements show a systematic change with Te content, consistent with bond relaxation in the inhomogeneous ternary phases. Also, the Fe-Te and Fe-S distances in the FeS 0.2 Te 0.8 ternary system are found to be different in the crystallographically homogeneous structure. The observed features are characteristic of ternary random alloys, suggesting that a proper consideration should be given to the atomic distribution for describing the complex electronic structure of these multi-band Fe-based chalcogenides.
Fichier non déposé

Dates et versions

hal-00717598 , version 1 (13-07-2012)

Identifiants

Citer

A. Iadecola, B. Joseph, Alessandro Puri, Laura Simonelli, Y. Mizuguchi, et al.. Random alloy-like local structure of Fe(Se, S) 1− x Te x superconductors revealed by extended x-ray absorption fine structure. Journal of Physics: Condensed Matter, 2011, 23 (42), pp.425701. ⟨10.1088/0953-8984/23/42/425701⟩. ⟨hal-00717598⟩
106 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More