AVS 59th Annual International Symposium and Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP10
Photoelectron Spectroscopy and Valence Band Studies of Non-Stoichiometric Superconducting FeSe1-xTex

Tuesday, October 30, 2012, 6:00 pm, Room Central Hall

Session: Surface Science Poster Session
Presenter: L. Huerta, Universidad Nacional Autonoma de Mexico
Authors: L. Huerta, Universidad Nacional Autonoma de Mexico
V. Ortíz, Universidad Nacional Autonoma de Mexico
M. Flores, Universidad de Guadalajara, Mexico
R. Escamilla, Universidad Nacional Autonoma de Mexico
Correspondent: Click to Email
Polycrystalline samples of Fe(Se1-xTex), with x = 0.0, 0.25, 0.50, 0.75 and 1.0, were synthesized by solid state reaction. The samples were characterized by x-ray diffraction (XRD), measurements magnetization vs. temperature and photoelectron spectroscopy (XPS). Results of x-ray diffraction shows that the effect of the substitution of Se by Te is increase the lattice parameters. Curves of magnetization vs. temperature shows superconductivity for x = 0.25, 0.5 and 0.75. Whereas, x-ray Photoelectron spectroscopy (XPS) identified the oxidation states of Fe 2p, Se 3d and Te 3d core levels associated with the chemical states Fe(Se1-xTex). Finally we compared the Valence Band obtained by XPS for each concentration of tellurium with the density of states electronic (DOS) reported.