Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 24, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/24/6/065006
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Funding
- AFOSR-MURI [FA9550-09-1-0603]
- US DOE [DE-AC02-07CH11358]
- State of Iowa through Iowa State University
- Alfred P Sloan Foundation
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Single crystals of K0.80Fe1.76Se2 were successfully grown from a ternary solution. We show that, although crystals form when cooling a near-stoichiometric melt, crystals are actually growing out of a ternary solution that remains liquid to at least 850 degrees C. We investigated their chemical composition, anisotropic magnetic susceptibility and resistivity, specific heat, thermoelectric power, London penetration depth and flux penetration via magneto-optical imaging. Whereas the samples appear to be homogeneously superconducting at low temperatures, there appears to be a broadened transition range close to T-c similar to 30 K that may be associated with small variations in stoichiometry.
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