The magnetic and transport properties of high-critical-current Tl2Ba2Ca2Cu3Ox superconducting thin films

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Abstract
Highly c‐axis‐oriented Tl2Ba2Ca2Cu3Ox superconducting thin films with the critical current density as high as 1×107 A/cm2 at 87 K were obtained by single‐target dc sputtering on LaAlO3(100) substrates followed by encapsulated compensate annealing. The strong linear temperature dependence of zero‐field critical current at low temperatures suggests a creep‐dominated behavior. Preliminary field dependence studies on the critical current density in low‐field regime (<2 kOe) shows no evidence of hysteresis commonly encountered in films with higher granularity. The scaling behavior of the global pinning force density exhibits strong resemblance to conventional type‐II superconductors with the pinning force density of the same order of magnitude as that in strong pinned NbN thin films.