The anisotropy of transport critical current densities (Jc) in Tl2Ba2Ca2Cu3Ox thin film was measured resistively at 77 K under magnetic fields up to 20 T. When the magnetic field was applied parallel to the a-b plane (a-b plane//B), the values of Jc were 1.2×104 and 1.5×103 A/cm2 at 5 and 16 T, respectively. On the other hand, in fields perpendicular to the a-b plane (a-b plane⊥B), Jc decreased drastically in the low field region. The irreversible magnetic field (Bc2*) values for (a-b plane//B) and (a-b plane⊥B) were 22.0 and 0.89 T, respectively. The pinning force density (Fp=Jc×B) can be described by the Kramer scaling law, Fp/Fpmax=3.4×b1/2(1-b)2, where b (B/Bc2*) is the reduced field. From measuring the angular dependence of Jc, as incident angle (θ) increased, Jc decreased drastically.
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