Abstract
In the present work, we have studied the effect of doping Te at the Se-site on the superconducting properties, such as transition temperature (Tc), upper critical field (Hc2) and irreversibility field (Hirr) of FeSe. The polycrystalline samples have been prepared via solid state reaction route with nominal compositions FeSe1−xTex (x = 0.0, 0.25, 0.50 and 0.75). The X-ray diffraction results show the tetragonal α-FeSe phase with the p4/nmm space group symmetry in all the samples. The values of Hc2(0) estimated from Werthamer-Helfand-Hohenberg (WHH) and Ginzburg-Landau (GL) theories are found to follow the same trends and maximum Hc2(0) is found for the composition x = 0.50. The irreversibility field, Hirr and activation energy, U0 were also calculated to see the vortex motion behavior in the samples.
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