Abstract

The magnetoresistance was measured on oriented thin film TlBaCaCuO samples in pulsed high magnetic fields up to 40 T, by a PSD method at frequencies of 200 kHz, for the two fundamental orientations of the film in the magnetic field. T c was defined at the midpoint of the transition curve. We obtained -d B c2 // /d T =20 T/K and -d B c2 ⊥ /d T =0.6 T/K, for the magnetic field parallel and perpendicular to the film plane, respectively, which give a large anisotropy of the upper critical field B c2 ( T ) of 33. The estimated coherence lengths are ξ ⊥ (0)=0.8 Å and ξ // (0)=28 Å.

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