Effect of substitution and heat treatment route on polycrystalline FeSe0.5Te0.5 Superconductors

TL;DR

This study investigates how Te substitution and heat treatment affect the structural, electronic, and magnetic properties of polycrystalline FeSe0.5Te0.5 superconductors, revealing optimal doping levels for enhanced superconductivity.

Contribution

It provides new insights into the relationship between Te substitution levels, heat treatment, and superconducting properties in FeSe-based materials.

Findings

Maximum superconductivity observed at x=0.67 Te substitution.

Tc increases with Te content up to 75%.

Lattice parameter c increases monotonically with Te concentration.

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=0.5350{\deg}C, 0.5700{\deg}C, 0.6700{\deg}C and 0.75700{\deg}C were synthesized by the solid-state reaction method. It has been observed that the most superconducting properties seen in x=0.6700{\deg}C 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.