Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x

Details Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x

2009-02-09

arxiv.org/abs/0902.1519v1

Phy. Rev. B. 79, 094521 (2009)

Physics

Condensed Matter

Superconductivity

Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.094521

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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