Abstract:The temperature and magnetic field dependence of the critical current density (J c) and pinning force density (F p) in Bi 1.6 Pb 0.4 Sr 2 Ca 2Àx Na x Cu 3 O 10+d (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) high-temperature superconductors is reported. Polycrystalline samples were prepared by a conventional solid-state reaction route. The influence of Na substitution on J c and F p at temperatures ranging between 65 K and 25 K was investigated. The collective pinning model is successfully applied to describe the … Show more
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