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Magnetisation and magneto-resistance measurements have been carried out on superconducting Ba 1−x K x Fe 2 As 2 samples with x=0.40 and 0.50. From high field magnetization hysteresis measurements carried out in fields up to 16T at 4.2K and 20K, the critical current density has been evaluated using the Bean critical state model. The J C determined from the...
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