Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-09
Supercond. Sci. Technol. 24 065006 (2011)
Physics
Condensed Matter
Superconductivity
7 pages, 7 figures
Scientific paper
Single crystals of K0.80Fe1.76Se2.02 were suscessfully 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 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 transtion range close to Tc ~ 30 K that may be associated with small variations in stociometry.
Bud'ko Sergey L.
Canfield Paul. C.
Cho Kihyeon
Hodovanets H.
Hu Rongwei
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