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APS » Journals » Phys. Rev. B » Volume 79 » Issue 9
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Phys. Rev. B 79, 094521 (2009) [5 pages]

Bulk superconductivity at 14 K in single crystals of Fe1+yTexSe1−x

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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

Received 10 February 2009; published 24 March 2009

See accompanying Physics Synopsis

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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.094521
DOI:
10.1103/PhysRevB.79.094521
PACS:
74.70.−b, 81.10.−h, 74.25.Ha
 
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