Synthesis and Physical Properties of FeSe1/2Te1/2 Superconductor

TL;DR

This paper reports the synthesis, structural characterization, and physical properties of FeSe1/2Te1/2 superconductor with a critical temperature of 13 K, highlighting its robustness under magnetic fields and detailed superconducting parameters.

Contribution

It presents the successful synthesis and detailed physical property analysis of FeSe1/2Te1/2 superconductor, including critical fields and structural data, advancing understanding of FeSe-based superconductors.

Findings

Bulk superconductivity confirmed at 13 K

Lower critical field Hc1 around 180 Oe

Upper critical field Hc2(0) estimated at 1840 kOe

Abstract

One of the most important properties of very recently reported FeSe based superconductors is the robustness of their superconductivity under applied magnetic field. The synthesis and control of superconductivity in FeSe based compounds is rather a difficult task. Synthesis and physical property characterization for optimized superconductivity of FeSe1/2Te1/2 at 13 K is reported here. The compound crystallized in a tetragonal structure with lattice parameters a = 3.8008(10) and c = 6.0187 (15) A. Magnetization measurements indicated bulk superconductivity with lower critical field (Hc1) of around 180 Oe. By applying Ginzburg Landau (GL) theory, the Hc2(0) value is estimated to be = 1840 kOe for the 90% of resistive transition. A heat capacity measurement revealed bulk superconductivity by a hump at Tc near 13 K, and an expected decrease was observed under an applied magnetic field.