Hall effect anomaly near Tc and renormalized superconducting
fluctuations in YBCO
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by
I. Puica
University of Vienna, Austria
2004
Abstract
Measurements of the Hall effect and the resistivity on precisely-patterned
YBCO thin films in magnetic fields B from 0.5 to 6 T oriented parallel to the
sample crystallographic c axis reveal a sign reversal of the Hall coefficient
for B <= 3 T. The data are compared to the full, quantitative expressions based
on the renormalized fluctuation model for the Hall conductivity. The model
offers a satisfactory understanding of the experimental results, for moderate
fields and temperatures near the critical region, provided that the
inhomogeneity of the critical temperature distribution is also taken into
account. We also propose an approach how vortex pinning that strongly affects
the magnitude of the Hall coefficient can be incorporated in the model.
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