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Type: Artigo de periódico
Title: Pressure And Chemical Substitution Effects In The Local Atomic Structure Of Bafe2as2
Author: Granado E.
Mendonca-Ferreira L.
Garcia F.
Azevedo G.D.M.
Fabbris G.
Bittar E.M.
Adriano C.
Garitezi T.M.
Rosa P.F.S.
Bufaical L.F.
Avila M.A.
Terashita H.
Pagliuso P.G.
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 Ba 0.85K0.15Fe2As2 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 (L0.01 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)×10-3 GPa-1]. 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. © 2011 American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.83.184508
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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