Hall-conductivity sign reversal and fluctuations in YBa2Cu3O7δ films

Wu Liu, T. W. Clinton, A. W. Smith, and C. J. Lobb
Phys. Rev. B 55, 11802 – Published 1 May 1997
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Abstract

We measured the longitudinal and Hall resistive transitions of YBa2Cu3O7δ films in applied fields up to 9 T. The longitudinal fluctuation conductivities obey the scaling behavior of the three-dimensional Hartree fluctuation theory of Ullah and Dorsey. The fluctuation Hall conductivities do not scale. Our analysis shows that there are substantial contributions from the Maki-Thompson (MT) process as well as the Aslamazov-Larkin (AL) one. Using an ansatz suggested by the microscopic theory of Fukuyama et al., we separated the AL term from the total fluctuation conductivity. The AL Hall conductivity follows a scaling law, and the AL and MT terms have opposite sign. The sign of the AL term is consistent with the sign change in the flux-flow regime, as predicted by theory. At low fields and temperatures just above Tc(H), the AL term dominates the MT term, therefore causing the total Hall-conductivity sign change.

    DOI:https://doi.org/10.1103/PhysRevB.55.11802

    ©1997 American Physical Society

    Authors & Affiliations

    Wu Liu, T. W. Clinton, A. W. Smith, and C. J. Lobb

    • Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742

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    Issue

    Vol. 55, Iss. 17 — 1 May 1997

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