Critical currents and thermally activated flux motion in high-temperature superconductors

20 February 1989

journal article
Published by AIP Publishing in Applied Physics Letters

Vol. 54 (8) , 763-765
https://doi.org/10.1063/1.101474

Abstract

We have measured the resistance below Tc of single crystals of the high-temperature superconductors Ba2YCu3O7 and Bi2.2Sr2Ca0.8Cu2O8+δ in magnetic fields up to 12 T. The resistive transition of both compounds is dominated by intrinsic dissipation which is thermally activated, resulting in an exponential temperature dependence of the resistivity well below Tc. The dissipation is significantly larger and of different character in the Bi-Cu compound than in Ba2YCu3O7. The relation between the activated behavior and the depinning critical current is discussed.

Keywords

This publication has 16 references indexed in Scilit:

Evidence from Mechanical Measurements for Flux-Lattice Melting in Single-Crystal Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{7}$ and ${Bi}_{2.2}$ ${Sr}_{2}$ ${Ca}_{0.8}$ ${Cu}_{2}$ $O_{8}$
Physical Review Letters, 1988
Resistive Transition of High-Temperature Superconductors
Physical Review Letters, 1988
Angular dependence of the upper critical field of ${Bi}_{2.2}$ ${Sr}_{2}$ ${Ca}_{0.8}$ ${Cu}_{2}$ $O_{8 + δ}$
Physical Review B, 1988
Normal-state transport parameters of epitaxial thin films of $Y {Ba}_{2} {Cu}_{3} O_{7 - δ}$
Physical Review B, 1988
Non-Ohmic dissipative regime in the superconducting transition of polycrystalline $Y_{1}$ ${Ba}_{2}$ ${Cu}_{3}$ $O_{x}$
Physical Review Letters, 1988
Critical-magnetic-field anisotropy in single-crystal ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$
Physical Review B, 1988
Magnetic characterization of rare-earth barium cuprate superconductors
Physical Review B, 1987
Superconductivity in YBa2Cu3O7 single crystals
Nature, 1987
The Anisotropic Upper Critical Field of Single Crystal YBa₂Cu₃O_x
Japanese Journal of Applied Physics, 1987
Theory of Flux Creep in Hard Superconductors
Physical Review Letters, 1962