Growth and Characterization of Fe0.95Se0.6Te0.4 Single Crystal

TL;DR

This study reports the growth and detailed characterization of Fe0.95Se0.6Te0.4 single crystals, confirming their superconducting properties at 14 K and analyzing their structural and magnetic features.

Contribution

It introduces a modified Bridgman technique for growing high-quality FeSeTe single crystals and provides comprehensive structural, magnetic, and spectroscopic characterization.

Findings

Superconducting transition at 14 K confirmed.

Single crystal nature verified by X-ray diffraction.

Critical magnetic field H_c1(0) ~360 Oe determined.

Abstract

In this paper we present the single crystal growth of Fe0.95Se0.6Te0.4 high TC superconducting sample by the modified Bridgman technique. The x-ray diffraction pattern shows the single crystal nature of the sample, as only (00l) peaks are detectable. The stoichiometric composition has been verified by energy dispersive x-ray analysis. The superconducting transition temperature at 14 K was confirmed through DC magnetization (ZFC-FC) and resistivity measurements. By analyzing the isothermal M-H curves, we determined the value of H_c1 (0) ~360 Oe by extrapolating the data. The temperature coefficient of resistivity obtained using the power law fitting was found to be 0.6. The obtained Raman spectra at room temperature can be interpreted with the tetragonal crystal structure and space group P4/nmm.