Local inhomogeneity and surface degradation of Fe1.15Te and Fe1.03Te0.62Se0.38 single crystals
Journal
Journal of Materials Science
Journal Volume
46
Journal Issue
23
Pages
7582-7587
Date Issued
2011
Author(s)
Abstract
We have investigated the structural and magnetic properties of Fe 1.15Te and Fe1.03Te0.62Se0.38 single crystals grown by slow cooling method using a specially designed double-walled quartz ampoule. X-ray diffraction reveals significant local inhomogeneity as a result of fractional substitution of Te site by Se in single crystal Fe 1.15Te and Fe1.03Te0.62Se0.38. The existence of superconductivity is confirmed for Se substitution to the Te site of Fe1.15Te and Fe1.03Te0.62Se0.38 but with persistent Fe7Se8 impurity phase. Raman spectroscopy confirmed the surface structural instability when the samples were exposed to moderate laser irradiation in the atmospheric environment. With high intensity laser irradiation, Fe(Se,Te) compounds can be decomposed into Fe2O 3 hematite phase. © Springer Science+Business Media, LLC 2011.
Type
journal article