Abstract
Resistivity, magnetic susceptibility, and heat-capacity measurements are reported for single crystals of grown via a modified Bridgeman method with and , 0.9, 0.75, 0. 67, 0.55, and 0.5. Although resistivity measurements show traces of superconductivity near 14 K for all except , only crystals grown with compositions near 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 , the concentration of Fe in the Fe(2) site.
- Received 10 February 2009
DOI:https://doi.org/10.1103/PhysRevB.79.094521
©2009 American Physical Society
Synopsis
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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