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Centimeter sized platelet single crystals of KFe2As2 were grown using aself-flux method. An encapsulation technique using commercial stainless steelcontainer allowed the stable crystal growth lasting for more than 2 weeks.Ternary K-Fe-As systems with various starting compositions were examined todetermine the optimal growth conditions. Employment of KAs flux led to thegrowth of large single crystals with the typical size of as large as 15 mm x 10mm x 0.4 mm. The grown crystals exhibit sharp superconducting transition at 3.4K with the transition width 0.2 K, as well as the very large residualresistivity ratio exceeding 450, evidencing the good sample quality.

Single Crystal Growth and Characterization of the Iron-Based Superconductor KFe2As2 Synthesized by KAs Flux Method