Flux free growth of large FeSe1/2Te1/2 superconducting single crystals by an easy high temperature melt and slow cooling method

TL;DR

This paper presents a simple high-temperature melt and slow cooling method for growing large, flux-free FeSe1/2Te1/2 single crystals, demonstrating their superconducting properties with a Tc of around 11.5K.

Contribution

The study introduces an easy, flux-free growth technique for large FeSe1/2Te1/2 single crystals with detailed superconducting characterization.

Findings

Crystals up to a few centimeters in size were successfully grown.

Superconducting transition temperature (Tc) is approximately 11.5K.

Type-II superconducting behavior observed with a lower critical field above 200 Oe at 0K.

Abstract

We report successful growth of flux free large single crystals of superconducting FeSe1/2Te1/2 with typical dimensions of up to few cm. The AC and DC magnetic measurements revealed the superconducting transition temperature (Tc) value of around 11.5K and the iso-thermal MH showed typical type-II superconducting behavior. The lower critical field being estimated by measuring the low field iso-thermal magnetization in superconducting regime is found to be above 200 Oe at 0K.