Abstract
We report the growth of superconducting YBa 2 (Cu,Co) 4 O 8 single crystals using KOH flux under ambient pressure and their superconducting properties. The average size of the YBa 2 (Cu,Co) 4 O 8 single crystals is 0.3 ×0.3 ×0.2 mm 3 . The superconducting transition temperature ( T c ) of the parent material is found to be 81 K, indicating a stoichiometric oxide superconductor. The T c and the c -axis length of YBa 2 (Cu,Co) 4 O 8 single crystals decrease systematically with increasing the Co-doping content. A comparison of the magnetic irreversibility with the flux-creep theory from the viewpoint of homogeneity/inhomogeneity is made.
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