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Anisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals

TitleAnisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals
Publication TypeJournal Article
Year of Publication2011
AuthorsHu R, Cho K, Kim H, Hodovanets H, Straszheim WE, Tanatar MA, Prozorov R, Bud'ko SL, Canfield PC
Journal TitleSuperconductor Science & Technology
Volume24
Pages065006
Date Published06
ISBN Number0953-2048
Accession NumberISI:000290472900008
Abstract

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.
URL<Go to ISI>://000290472900008
DOI10.1088/0953-2048/24/6/065006
Alternate JournalSupercond Sci TechSupercond Sci Tech