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
DOI 10.1103/PhysRevB.80.165108 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Anisotropic Fe K-edge and As K-edge x-ray absorption near-edge spectrum measurements on superconducting (Tc=52 K) (Sm0.95La0.05)FeAs(O0.85F0.15) field-aligned microcrystalline powder are presented. The angular dependence of Fe pre-edge peak (dipole transition of Fe 1s electrons to Fe 3d/As 4p 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 Fe K-edge spectra exhibit a chemical shift to lower energy compared to FeO which are closely related to the itinerant character of Fe2+ 3d6 orbitals. The anisotropic As K-edge spectra are more or less the mirror images of Fe K edge due to the symmetrical Fe-As hybridization in the FeAs layer. Angular dependence of As main peak (dipole transition of As 1s electrons to higher-energy hybrid bands) was observed suggesting character of As 4deg orbitals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Sm0.95La0.05)FeAs(O0.85F0.15) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52 | Pressure not reported | onset |
Similar papers
ac susceptibility investigation of vortex dynamics in nearly optimally doped RFeAsO1−xFx superconductors (R = La, Ce, Sm)
similarity 0.94G. Prando et al.
Source status unknown — claims are unverified
Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO1−xFx
similarity 0.94G. Garbarino et al.
Source status unknown — claims are unverified
Anomalous Transport Properties and Phase Diagram of the FeAs-Based SmFeAsO1−xFx Superconductors
similarity 0.93R. H. Liu et al.
Source status unknown — claims are unverified
Angular Dependence of X-ray Absorption Spectrum for Field-aligned Fe-based Superconductors
similarity 0.93B. C. Chang et al. · 2009 · arXiv:0909.3904
Source status unknown — claims are unverified
Muon spin rotation studies of SmFeAsO0.85 and NdFeAsO0.85 superconductors
similarity 0.92Rustem Khasanov et al.
Source status unknown — claims are unverified
Effect of pressure on the superconducting and spin-density-wave states of SmFeAsO1−xFx
similarity 0.92B. Lorenz et al.
Source status unknown — claims are unverified