Abstract
Magnetotransport studies were carried out on thin film samples of Er Ba 2 Cu 3 O 7−y and Bi 2 Sr 2 CaCu 2 O 8 +y in the superconducting transition region. The fluctuation contribution to the Hall conductivity, Δσ xy , is negative in sign and shows a stronger singularity than Δσ xx , as T c is approached from above. The magnetic-field-induced broadening of the resistive transition is found to be completely independent of the relative orientation between current and magnetic field, posing a serious question to the conventional picture of Lorentz-force-driven flux creep. The Hall effect in the resistive state exhibits a complicated temperature and field dependence, including threshold behavior and sign reversal.
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