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Single crystals of K0.80Fe1.76Se2.02 were suscessfully grown from a ternarysolution. We show that although crystals form when cooling a nearstoichiometric melt, crystals are actually growing out of a ternary solutionthat remains liquid to at least 850 C. We investigated their chemicalcomposition, anisotropic magnetic susceptibility and resistivity, specificheat, thermoelectric power, London penetration depth and flux penetration viamagneto-optical imaging. Whereas the samples appear to be homogeneouslysuperconducting at low temperatures, there appears to be a broadened transtionrange close to Tc ~ 30 K that may be associated with small variations instociometry.

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