Local structural investigation of SmFeAsO1-xFx high temperature superconductors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lorenzo Malavasi
  • Gianluca A Artioli
  • Hyunjeong Kim
  • Beatrice Maroni
  • Boby Joseph
  • Thomas Proffen
  • Simon J L Billinge

Detail(s)

Original languageEnglish
Article number272201
Journal / PublicationJournal of Physics Condensed Matter
Volume23
Issue number27
Publication statusPublished - 13 Jul 2011
Externally publishedYes

Abstract

A strong revitalization of the field of high temperature superconductivity (HTSC) has been induced recently by the discovery of TC around 26 K in F-doped LaFeAsO iron pnictides. Starting from this discovery, a huge amount of experimental data have been accumulated. This important corpus of results will allow the development of suitable theoretical models aimed at describing the basic electronic structure properties and nature of superconducting states in these fascinating new systems. A close correlation between structural features and physical properties of the normal and superconducting states has already been demonstrated in the current literature. Advanced theoretical models are also based on the close correlation with structural properties and in particular with the Fe-As tetrahedral array. As for other complex materials, a deeper understanding of their structure-properties correlation requires a full knowledge of the atomic arrangement within the structure. Here we report an investigation of the local structure in the SmFeAsO1-xFx system carried out by means of x-ray total scattering measurements and pair distribution function analysis. The results presented indicate that the local structure of these HTSC significantly differs from the average structure determined by means of traditional diffraction techniques, in particular the distribution of Fe-As bond lengths. In addition, a model for describing the observed discrepancies is presented. © 2011 IOP Publishing Ltd.

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Citation Format(s)

Local structural investigation of SmFeAsO1-xFx high temperature superconductors. / Malavasi, Lorenzo; Artioli, Gianluca A; Kim, Hyunjeong; Maroni, Beatrice; Joseph, Boby; Ren, Yang; Proffen, Thomas; Billinge, Simon J L.

In: Journal of Physics Condensed Matter, Vol. 23, No. 27, 272201, 13.07.2011.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review