Abstract
The diagonal and Hall conductivities of thin film samples of ErBa 2Cu 3O 7− y and Bi 2Sr 2CaCu 2O 8+ y have been studied in the superconducting transition region. Superconducting fluctuations above T c give rise to a negative contribution to the Hall conductivity. The excess Hall conductivity, Δσ xy , exhibits a stronger singularity than the excess diagonal conductivity, Δσ xy , in agreement with Fukuyama et al.'s theory. In the magnetic-field-induced resistive state below T c, the Hall angle exhibits complicated temperature- and field-dependent behavior, including sign change. The Hall effect behaviors is discussed in the light of the flux dynamics and the nature of the resistive state.
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