Physics and Astronomy, Ames Laboratory
Journal or Book Title
Superconductor Science and Technology
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 °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 Tc ~ 30 K that may be associated with small variations in stoichiometry.
IOP Publishing Ltd
Hu, R.; Cho, K.; Kim, H.; Hodovanets, H.; Straszheim, W. E.; Tanatar, Makariy A.; Prozorov, Ruslan; Bud’ko, Sergey L.; and Canfield, Paul C., "Anisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals" (2011). Physics and Astronomy Publications. 657.