title: A study of the electronic structure of FeSe(1-x)Te(x) chalcogenides by Fe and Se K-edge x-ray absorption near edge structure measurements.
abstract: Fe K-edge and Se K-edge x-ray absorption near edge structure (XANES) measurements are used to study the FeSe(1 - x)Te(x) electronic structure of chalcogenides. An intense Fe K-edge pre-edge peak due to Fe 1s --> 3d (and admixed Se/Te p states) is observed, showing substantial change with Te substitution and x-ray polarization. The main white line peak in the Se K-edge XANES due to Se 1s --> 4p transition appears similar to the one expected for Se(2-) systems and changes with Te substitution. Polarization dependence reveals that unoccupied Se orbitals near the Fermi level have predominant p(x, y) character. The results provide key information on the hybridization of Fe 3d and chalcogen p states in the Fe-based chalcogenide superconductors.
authors.affiliation: Dipartimento di Fisica, Università di Roma La Sapienza, Roma, Italy.
authors.forename: B
authors.initials: B
authors.lastname: Joseph
authors.forename: A
authors.initials: A
authors.lastname: Iadecola
authors.forename: L
authors.initials: L
authors.lastname: Simonelli
authors.forename: Y
authors.initials: Y
authors.lastname: Mizuguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Takano
authors.forename: T
authors.initials: T
authors.lastname: Mizokawa
authors.forename: N L
authors.initials: NL
authors.lastname: Saini