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

References in corpus (7)

• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• The superconductivity at 18 K in LiFeAs system
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Tellurium substitution effect on superconductivity of the alpha-phase Iron Selenide
• Thorium-doping induced superconductivity up to 56 K in Gd1-xThxFeAsO
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Substitution Effects on FeSe Superconductor