Effective activation energy in the Bi-Sr-Ca-Cu-O systems

Author

Sengupta, S. ; Shi, D. ; Wang, Z. ; Smith, M. ; McGinn, P.J.

Author_Institution

Argonne Nat. Lab., IL, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1226

Lastpage

1228

Abstract

Magnetic relaxation in the Bi-Sr-Ca-Cu-O systems was investigated over a wide temperature regime. Previously reported studies of the effective activation energy, U, have been controversial in terms of temperature and field dependence of the critical current density, j/sub c/. The authors considered the temperature dependence of j/sub c/ and constructed the U-j (or M) curves for the Bi-Sr-Ca-Cu-O system. They found that at a constant driving force and temperature, U is considerably higher for 2245 samples than for 2223 samples. This enhancement can be attributed to the flux pinning from finely dispersed calcium- and copper-rich precipitates.<>

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; strontium compounds; Bi-Sr-Ca-Cu-O; critical current density; effective activation energy; flux pinning; high temperature superconductors; precipitates; Annealing; Critical current density; Equations; Glass; Magnetic fields; Magnetic flux; Magnetic hysteresis; Magnetization; Superconducting magnets; Temperature dependence;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233404

Filename

233404