Angular dependence of x-ray absorption spectrum for field-aligned iron-based superconductors

B. C. Chang, Y. B. You, T. J. Shiu, M. F. Tai, H. C. Ku, Y. Y. Hsu, L. Y. Jang, J. F. Lee, Z. Wei, K. Q. Ruan, X. G. Li

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Anisotropic FeK -edge and AsK -edge x-ray absorption near-edge spectrum measurements on superconducting (Tc =52 K) (Sm0.95 La0.05) FeAs (O0.85 F0.15) field-aligned microcrystalline powder are presented. The angular dependence of Fe pre-edge peak (dipole transition of Fe1s electrons to Fe3d/As4p hybrid bands) relative to the tetragonal ab plane of aligned powder indicates larger density of state along the c axis and is consistent with the local-density approximation band-structure calculation. The anisotropic FeK -edge spectra exhibit a chemical shift to lower energy compared to FeO which are closely related to the itinerant character of Fe2+ 3 d6 orbitals. The anisotropic AsK -edge spectra are more or less the mirror images of FeK edge due to the symmetrical Fe-As hybridization in the FeAs layer. Angular dependence of As main peak (dipole transition of As1s electrons to higher-energy hybrid bands) was observed suggesting character of As4d eg orbitals.

Original languageEnglish
Article number165108
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number16
DOIs
Publication statusPublished - 2009 Oct 5

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x ray spectra
Electron transitions
x ray absorption
Powders
Absorption spectra
absorption spectra
iron
X rays
Local density approximation
Electrons
Chemical shift
Band structure
Mirrors
dipoles
orbitals
Iron-based Superconductors
chemical equilibrium
electrons
mirrors
energy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Angular dependence of x-ray absorption spectrum for field-aligned iron-based superconductors. / Chang, B. C.; You, Y. B.; Shiu, T. J.; Tai, M. F.; Ku, H. C.; Hsu, Y. Y.; Jang, L. Y.; Lee, J. F.; Wei, Z.; Ruan, K. Q.; Li, X. G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 16, 165108, 05.10.2009.

Research output: Contribution to journalArticle

Chang, B. C. ; You, Y. B. ; Shiu, T. J. ; Tai, M. F. ; Ku, H. C. ; Hsu, Y. Y. ; Jang, L. Y. ; Lee, J. F. ; Wei, Z. ; Ruan, K. Q. ; Li, X. G. / Angular dependence of x-ray absorption spectrum for field-aligned iron-based superconductors. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 16.
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AU - You, Y. B.

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AU - Ku, H. C.

AU - Hsu, Y. Y.

AU - Jang, L. Y.

AU - Lee, J. F.

AU - Wei, Z.

AU - Ruan, K. Q.

AU - Li, X. G.

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N2 - Anisotropic FeK -edge and AsK -edge x-ray absorption near-edge spectrum measurements on superconducting (Tc =52 K) (Sm0.95 La0.05) FeAs (O0.85 F0.15) field-aligned microcrystalline powder are presented. The angular dependence of Fe pre-edge peak (dipole transition of Fe1s electrons to Fe3d/As4p hybrid bands) relative to the tetragonal ab plane of aligned powder indicates larger density of state along the c axis and is consistent with the local-density approximation band-structure calculation. The anisotropic FeK -edge spectra exhibit a chemical shift to lower energy compared to FeO which are closely related to the itinerant character of Fe2+ 3 d6 orbitals. The anisotropic AsK -edge spectra are more or less the mirror images of FeK edge due to the symmetrical Fe-As hybridization in the FeAs layer. Angular dependence of As main peak (dipole transition of As1s electrons to higher-energy hybrid bands) was observed suggesting character of As4d eg orbitals.

AB - Anisotropic FeK -edge and AsK -edge x-ray absorption near-edge spectrum measurements on superconducting (Tc =52 K) (Sm0.95 La0.05) FeAs (O0.85 F0.15) field-aligned microcrystalline powder are presented. The angular dependence of Fe pre-edge peak (dipole transition of Fe1s electrons to Fe3d/As4p hybrid bands) relative to the tetragonal ab plane of aligned powder indicates larger density of state along the c axis and is consistent with the local-density approximation band-structure calculation. The anisotropic FeK -edge spectra exhibit a chemical shift to lower energy compared to FeO which are closely related to the itinerant character of Fe2+ 3 d6 orbitals. The anisotropic AsK -edge spectra are more or less the mirror images of FeK edge due to the symmetrical Fe-As hybridization in the FeAs layer. Angular dependence of As main peak (dipole transition of As1s electrons to higher-energy hybrid bands) was observed suggesting character of As4d eg orbitals.

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