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Single crystals of Ba0.6K0.4Fe2As2 with excellent quality have beensuccessfully grown without fluxing agent through a simple one-step method forthe first time. X-ray diffraction patterns demonstrate that the samples havehigh crystalline quality and c-axis orientation. The onset transitiontemperature is up to 38 K with the zero resistivity temperature about 36.7 K.Both the R-T and M-T data show a very sharp superconducting transition withtransition width 0.4 K. We also found that the samples possess very largecurrent carrying ability and high upper critical fields, indicating potentialapplications requiring very high field. The above simple and safe one-steptechnique of single crystal growth can be effective in other systems ofFe-based superconductors.

One-step method to grow Ba0.6K0.4Fe2As2 single crystals without fluxing agent