Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
B. C. Sales, A. S. Sefat, M. A. McGuire, R. Y. Jin, D. Mandrus, Y., Mozharivskyj
TL;DR
This study reports bulk superconductivity at 14 K in Fe1+yTexSe1-x single crystals, with the strongest effects near x=0.5 and low Fe excess, highlighting the influence of composition on superconducting properties.
Contribution
It demonstrates that bulk superconductivity in Fe1+yTexSe1-x is achieved near x=0.5 with minimal Fe excess, providing insights into composition-dependent superconductivity in this material.
Findings
Bulk superconductivity observed near 14 K for x≈0.5
Superconductivity correlates with reduced Fe excess and susceptibility
Crystals with x=1 show only traces of superconductivity
Abstract
Resistivity, magnetic susceptibility and heat capacity measurements are reported for single crystals of Fe1+yTexSe1-x grown via a modified Bridgeman method with 0 < y < 0.15, and x= 1, 0.9, 0.75, 0. 67, 0.55 and 0.5. Although resistivity measurements show traces of superconductivity near 14 K for all x except x=1, only crystals grown with compositions near x=0.5 exhibit bulk superconductivity. The appearance of bulk superconductivity correlates with a reduction in the magnitude of the magnetic susceptibility at room temperature and smaller values of y, the concentration of Fe in the Fe(2) site.
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