Abstract
Single crystals of K0.80Fe1.76Se2 were successfully grown from a ternary solution. We show that, althoughcrystals form when cooling a near-stoichiometric melt, crystals areactually growing out of a ternary solution that remains liquid to at least850 °C.We investigated their chemical composition, anisotropic magnetic susceptibility and resistivity,specific heat, thermoelectric power, London penetration depth and flux penetration viamagneto-optical imaging. Whereas the samples appear to be homogeneously superconductingat low temperatures, there appears to be a broadened transition range close toTc ∼ 30 K that may be associated with small variations in stoichiometry.
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