Effect of substitution and heat treatment route on polycrystalline FeSe0.5Te0.5 Superconductors
Abstract
The effect of atomic substitution of Te in iron based superconductors FeSe (1:1 type), which exhibits the simplest crystal structure among the iron-based superconductors, has been investigated in terms of structural, electronic transport and magnetic properties. Polycrystalline samples with nominal Se:Te in FeSe1-xTex samples for x=0.5350C, 0.5700C, 0.6700C and 0.75700C were synthesized by the solid-state reaction method. It has been observed that the most superconducting properties seen in x=0.6700C samples as dc magnetic susceptibility, ac susceptibility and resistivity measurements. Tc enhancement is well correlated with the Te substitution up to 75% and c lattice parameters monotonically increased with increasing Te concentration.
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