Resistivity-versus-temperature curves are measured for the single crystal of a Tl-Ba-Ca-Cu-O superconductor in applied magnetic fields up to 12T. The resistive superconducting transition broadens extremely in the field perpendicular to the c-plane. The anisotropic factor of H c2 is ∼4. The resistivity shows an exponential temperature dependence in the lower resistivity region, suggesting the occurrence of a thermally activated flux motion.
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Togano et al. (1989) studied this question.
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