Vortex-glass-liquid transition and critical current density in Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ superconductors

Author

Yamasaki, H. ; Endo, K. ; Mawatari, Y. ; Kosaka, S. ; Umeda, M. ; Yoshida, S. ; Kajimura, K.

Author_Institution

Electrotech. Lab., Ibaraki, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1888

Lastpage

1891

Abstract

We have investigated I-V characteristics in epitaxial Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/, thin films and Ag-sheathed tapes in magnetic fields applied parallel to the c-axis, and observed a transition from the vortex-liquid phase characterized by finite linear resistivity /spl rho//sub lin/=(E/J)/sub J/spl rarr/0/=constant, to the vortex-glass phase with vanishing linear resistivity. The transition shows quasi-2D nature and a power-law relation E/spl sim/J/sup z+1//spl ap/J/sup 6.5/ is observed at the transition temperature T/sub g/, while E/spl sim/J/sup z+1//2/spl ap/J/sup 3/ is observed in YBa/sub 2/Cu/sub 3/O/sub 7/ at T=T/sub g/, where z is a critical exponent. The importance of the vortex-glass transition in applied superconductivity is discussed.<>

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); flux-line lattice; high-temperature superconductors; strontium compounds; superconducting epitaxial layers; superconducting tapes; superconducting thin films; Ag-sheathed tapes; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O; I-V characteristics; critical current density; epitaxial thin films; finite linear resistivity; high temperature superconductors; power-law relation; vanishing linear resistivity; vortex glass-liquid transition; Bismuth; Conductivity; Critical current density; Glass; Magnetic fields; Magnetic films; Strontium; Superconducting thin films; Superconducting transition temperature; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402950

Filename

402950