Diminishing sign anomaly and scaling behavior of the mixed-state Hall resistivity in Tl₂Ba₂Ca₂Cu₃O₁₀ films containing columnar defects

Authors

R.C. Budhani, Brookhaven National Laboratory, Upton, New York
Sy_Hwang Liou, University of Nebraska-LincolnFollow
Z.X. Cai, Brookhaven National Laboratory, Upton, New York

Date of this Version

July 1993

Comments

Published by American Physical Society. Phys. Rev. Lett., 71, 621(1993). http://prl.aps.org. Copyright © 1993 American Physical Society. Permission to use.

Abstract

The issues of sign reversal of the Hall voltage and scaling between longitudinal (ρ_χχ) and Hall (ρ_χy) resistivities are studied in Tl₂Ba₂Ca₂Cu₃O₁₀ films in which the vortex dynamics is drastically changed by flux pinning at heavy-ion-irradiation–induced linear defects. While the sign anomaly diminishes with increasing defect concentration, the power law ρ_χy∼ρ_{χχ ^β} , β=1.85±0.1, holds even after irradiation. This result shows that the scaling is a universal feature of the mixed state in this system. The sign anomaly, on the other hand, is not consistent with a model that invokes pinning-induced backflow in the vortex core as the mechanism for this effect.