FeSe\({}_{\mathbf{0.5}}\)Te\({}_{\mathbf{0.5}}\) Films on Glass with CeO\({}_{\mathbf{2}}\) Doping

Abstract

Deposition modes for thin films of FeSe\({}_{0.5}\)Te\({}_{0.5}\) on an amorphous substrate made of K-208 glass, containing cerium oxide (CeO\({}_{2}\)), have been found. The transition temperature of the film, \(T_{\textrm{C}}=9.5\) K, to the superconducting state turned out to be higher than that on borosilicate glass from Fischer Scientific, which does not contain CeO\({}_{2}\), but lower than the superconducting transition temperature of the target, \(T_{\textrm{C}}(M)=14\) K. This behavior contrasts with the well-known properties of thin films in the FeSe and FeSe\({}_{x}\)Te\({}_{1-x}\) family on crystalline substrates. Based on the measurement results, the vortex activation energy (U), the critical current density (\(j_{\textrm{C}}\)), the upper critical field (\(H_{C2}\)), and the irreversibility field (\(H_{\textrm{irr}}\)) have been obtained.