Co-substitution effects on the Fe valence in the BaFe 2As 2 superconducting compound: A study of hard x-ray absorption spectroscopy

E. M. Bittar; C. Adriano; T. M. Garitezi; P. F.S. Rosa; L. Mendonça-Ferreira; F. Garcia; G. D.M. Azevedo; P. G. Pagliuso; E. Granado

doi:10.1103/PhysRevLett.107.267402

Co-substitution effects on the Fe valence in the BaFe ₂As ₂ superconducting compound: A study of hard x-ray absorption spectroscopy

E. M. Bittar
, C. Adriano
, T. M. Garitezi
, P. F.S. Rosa
, L. Mendonça-Ferreira
, F. Garcia
, G. D.M. Azevedo
, P. G. Pagliuso
, E. Granado

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The Fe K x-ray absorption near edge structure of BaFe _2-xCo _xAs ₂ superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.

Original language	English
Article number	267402
Journal	Physical Review Letters
Volume	107
Issue number	26
DOIs	https://doi.org/10.1103/PhysRevLett.107.267402
State	Published - Dec 20 2011
Externally published	Yes

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Bittar, E. M., Adriano, C., Garitezi, T. M., Rosa, P. F. S., Mendonça-Ferreira, L., Garcia, F., Azevedo, G. D. M., Pagliuso, P. G., & Granado, E. (2011). Co-substitution effects on the Fe valence in the BaFe ₂As ₂ superconducting compound: A study of hard x-ray absorption spectroscopy. Physical Review Letters, 107(26), Article 267402. https://doi.org/10.1103/PhysRevLett.107.267402

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title = "Co-substitution effects on the Fe valence in the BaFe 2As 2 superconducting compound: A study of hard x-ray absorption spectroscopy",

abstract = "The Fe K x-ray absorption near edge structure of BaFe 2-xCo xAs 2 superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.",

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doi = "10.1103/PhysRevLett.107.267402",

language = "English",

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journal = "Physical Review Letters",

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T2 - A study of hard x-ray absorption spectroscopy

AU - Bittar, E. M.

AU - Adriano, C.

AU - Garitezi, T. M.

AU - Rosa, P. F.S.

AU - Mendonça-Ferreira, L.

AU - Garcia, F.

AU - Azevedo, G. D.M.

AU - Pagliuso, P. G.

AU - Granado, E.

PY - 2011/12/20

Y1 - 2011/12/20

N2 - The Fe K x-ray absorption near edge structure of BaFe 2-xCo xAs 2 superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.

AB - The Fe K x-ray absorption near edge structure of BaFe 2-xCo xAs 2 superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.

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U2 - 10.1103/PhysRevLett.107.267402

DO - 10.1103/PhysRevLett.107.267402

M3 - Article

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VL - 107

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26

M1 - 267402

ER -

Co-substitution effects on the Fe valence in the BaFe 2As 2 superconducting compound: A study of hard x-ray absorption spectroscopy

Abstract

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Co-substitution effects on the Fe valence in the BaFe ₂As ₂ superconducting compound: A study of hard x-ray absorption spectroscopy