Journal
PHYSICAL REVIEW B
Volume 79, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.094521
Keywords
crystal growth from melt; iron compounds; magnetic susceptibility; specific heat; superconductivity; tellurium compounds
Funding
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U. S. Department of Energy
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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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