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Evidence of local structural inhomogeneity in FeSe1xTex from extended x-ray absorption fine structure

B. Joseph, A. Iadecola, A. Puri, L. Simonelli, Y. Mizuguchi, Y. Takano, and N. L. Saini
Phys. Rev. B 82, 020502(R) – Published 8 July 2010

Abstract

Local structure of FeSe1xTex has been studied by extended x-ray absorption fine-structure (EXAFS) measurements as a function of temperature. Combination of Se and FeK edge EXAFS has permitted to quantify the local interatomic distances and their mean-square relative displacements. The Fe-Se and Fe-Te bond lengths in the ternary system are found to be very different from the average crystallographic Fe-Se/Te distance, and almost identical to the Fe-Se and Fe-Te distances for the binary FeSe and FeTe systems, indicating distinct site occupation by the Se and Te atoms. The results provide a clear evidence of local inhomogeneities and coexisting electronic components in the FeSe1xTex, characterized by different local structural configurations, with direct implication on the fundamental electronic structure of these superconductors.

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  • Received 24 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.020502

©2010 American Physical Society

Authors & Affiliations

B. Joseph1, A. Iadecola1, A. Puri1,2, L. Simonelli3, Y. Mizuguchi4,5, Y. Takano4,5, and N. L. Saini1

  • 1Dipartimento di Fisica, Università di Roma “La Sapienza,” P. le Aldo Moro 2, 00185 Roma, Italy
  • 2INFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Rome, Italy
  • 3European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP 220 38043, Grenoble Cedex 9, France
  • 4National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
  • 5JST-TRIP, 1-2-1 Sengen, Tsukuba 305-0047, Japan

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Issue

Vol. 82, Iss. 2 — 1 July 2010

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