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Bulk superconductivity at 14 K in single crystals of Fe1+yTexSe1x

B. C. Sales, A. S. Sefat, M. A. McGuire, R. Y. Jin, D. Mandrus, and Y. Mozharivskyj
Phys. Rev. B 79, 094521 – Published 24 March 2009
Physics logo See Synopsis: A route to large pnictide single crystals

Abstract

Resistivity, magnetic susceptibility, and heat-capacity measurements are reported for single crystals of Fe1+yTexSe1x 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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  • Received 10 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.094521

©2009 American Physical Society

Synopsis

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A route to large pnictide single crystals

Published 30 March 2009

The addition of tellurium helps to grow large single crystals of an iron-based superconductor.

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Authors & Affiliations

B. C. Sales, A. S. Sefat, M. A. McGuire, R. Y. Jin, and D. Mandrus

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Y. Mozharivskyj

  • Department of Chemistry, McMaster University, Hamilton, ON, Canada L8S 4M1

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Issue

Vol. 79, Iss. 9 — 1 March 2009

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