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Abstract: Anisotropic Fe K-edge and As K-edge X-ray absorption near edge spectrumXANES measurements on superconducting T c = 52 KSm {0.95}La {0.05}FeAsO {0.85}F {0.15} field-aligned microcrystallinepowder are presented. The angular dependence of Fe pre-edge peak dipoletransition of Fe-1s electrons to Fe-3d-As-4p hybrid bands relative to thetetragonal ab-plane of aligned powder indicates larger density of state DOSalong the c-axis, and is consistent with the LDA band structure calculation.The anisotropic Fe K-edge spectra exhibit a chemical shift to lower energycompared to FeO which are closely related to the itinerant character ofFe^{2+}-3d^6 orbitals. The anisotropic As K-edge spectra are more or less themirror images of Fe K-edge due to the symmetrical Fe-As hybridiztion in theFeAs layer. Angular dependence of As main peak dipole transition of As-1selectrons to higher energy hybrid bands was observed suggesting character ofAs-4d e g orbitals.



Author: B. C. Chang, Y. B. You, T. J. Shiu, M. F. Tai, H. C. Ku, Physics, NTHU, Hsinchu, Taiwan Y. Y. Hsu, Physics, NTNU, Taipei, Taiwan

Source: https://arxiv.org/







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