Abstract
Enhancement of superconducting transition temperature (Tc) of parent superconductor, Fe1+xSe, of ‘Fe-11’ family by Cr-substitution for excess Fe has been motivated us to investigate the effect of Cr-substitution in optimal superconductor of Fe1+xSe0.5Te0.5 at Fe site. Here, we report structural, magnetic, electrical transport, thermal transport and heat capacity properties of Cr-substitute compounds. x-ray diffraction measurement confirms the substitution of Cr-atoms in host lattice. Magnetic and electrical transport measurements are used to explore the superconducting properties where Cr-substituted compounds show improvement in superconducting diamagnetic fraction with same Tc as undoped one. Heat capacity measurement confirms the bulk superconducting properties of compounds. Thermopower measurement characterizes the type of charge carriers in normal state.
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