Sample size effect on the determination of the irreversibility line of high-T c superconductors

10 January 1994

journal article
conference paper
Published by AIP Publishing in Applied Physics Letters

Vol. 64 (2) , 250-252
https://doi.org/10.1063/1.111519

Abstract

The irreversibility lines of a high‐J_c superconducting Bi₂Sr₂Ca₂Cu₃O_x/Ag tape were systematically measured upon a sequence of subdivisions of the sample. The irreversibility field H_r(T) (parallel to the c axis) was found to change approximately as L^0.13, where L is the effective dimension of the superconducting tape. Furthermore, it was found that the irreversibility line for a grain‐aligned Bi₂Sr₂Ca₂Cu₃O_x specimen can be approximately reproduced by the extrapolation of this relation down to a grain size of a few tens of micrometers. The observed size effect could significantly obscure the real physical meaning of the irreversibility lines. In addition, this finding surprisingly indicated that the Bi₂Sr₂Ca₂Cu₂O_x/Ag tape and grain‐aligned specimen may have similar flux line pinning strength.

Keywords

This publication has 11 references indexed in Scilit:

Identifying the loss of critical current density in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ thin films
Physical Review B, 1993
Critical-state scaling and weak links in Ag-sheathed ${Bi}_{2}$ ${Sr}_{2}$ ${Ca}_{2}$ ${Cu}_{3}$ $O_{z}$
Physical Review B, 1992
Behavior of critical currents in Bi-Pb-Sr-Ca-Cu-O/Ag tapes from transport and magnetization measurements: Dependence upon temperature, magnetic field, and field orientation
Physical Review B, 1992
Magnetically measured irreversibility temperatures in superconducting oxides and alloys
Superconductor Science and Technology, 1992
Work instability and its influence on the critical current density of silver sheathed Bi2223 tapes
Superconductor Science and Technology, 1992
Irreversibility temperatures of ${Nb}_{3}$ Sn and Nb-Ti
Physical Review Letters, 1991
Irreversibility temperatures in superconducting oxides: The flux-line-lattice melting, the glass-liquid transition, or the depinning temperatures
Physical Review B, 1991
Irreversibility temperatures in c-axis-oriented powders of ${YBa}_{2}$ ${Cu}_{3}$ $O_{7}$ , ${Bi}_{2}$ ${Sr}_{2}$ ${CaCu}_{2}$ $O_{8}$ , and ${Bi}_{2}$ ${Sr}_{2}$ ${Ca}_{2}$ ${Cu}_{3}$ $O_{10}$
Physical Review B, 1990
Electromagnetic Properties and Morphology of Ag-Sheathed Bi-Pb-Sr-Ca-Cu-O Superconducting Wires
Japanese Journal of Applied Physics, 1989
Flux trapping and superconductive glass state in ${La}_{2}$ ${CuO}_{4 - y}$ :Ba
Physical Review Letters, 1987