Pressure and chemical substitution effects in the local atomic structure of BaFe2As2

E. Granado, L. Mendonça-Ferreira, F. Garcia, G. de M. Azevedo, G. Fabbris, E. M. Bittar, C. Adriano, T. M. Garitezi, P. F. S. Rosa, L. F. Bufaiçal, M. A. Avila, H. Terashita, and P. G. Pagliuso
Phys. Rev. B 83, 184508 – Published 17 May 2011

Abstract

The effects of K and Co substitutions and quasihydrostatic applied pressure (P<9 GPa) in the local atomic structure of BaFe2As2, Ba(Fe0.937Co0.063)2As2 and Ba0.85K0.15Fe2As2 superconductors were investigated by extended x-ray absorption fine structure (EXAFS) measurements in the As K absorption edge. The As-Fe bond length is found to be slightly reduced (0.01 Å) by both Co and K substitutions, without any observable increment in the corresponding Debye-Waller factor. Also, this bond is shown to be compressible [κ=3.3(3)×103 GPa1]. The observed contractions of As-Fe bond under pressure and chemical substitutions are likely related with a reduction of the local Fe magnetic moments, and should be an important tuning parameter in the phase diagrams of the Fe-based superconductors.

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  • Received 2 February 2011

DOI:https://doi.org/10.1103/PhysRevB.83.184508

©2011 American Physical Society

Authors & Affiliations

E. Granado1,2,*, L. Mendonça-Ferreira3, F. Garcia2, G. de M. Azevedo4, G. Fabbris1,2, E. M. Bittar1,2, C. Adriano1, T. M. Garitezi1, P. F. S. Rosa1, L. F. Bufaiçal5, M. A. Avila6, H. Terashita1,2, and P. G. Pagliuso1

  • 1Instituto de Física “Gleb Wataghin,” Universidade Estadual de Campinas - UNICAMP, 13083-859, Campinas, SP, Brazil
  • 2Laboratório Nacional de Luz Síncrotron, 13083-970, Campinas, SP, Brazil
  • 3Instituto de Física e Matemática, Universidade Federal de Pelotas, 96010-900, Pelotas, RS, Brazil
  • 4Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970, Porto Alegre, RS, Brazil
  • 5Instituto de Física, Universidade Federal de Goiás, 74001-970, Goiânia, GO, Brazil
  • 6Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-170, Santo André, SP, Brazil

  • *egranado@ifi.unicamp.br

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Vol. 83, Iss. 18 — 1 May 2011

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