Experimental investigation of pinning potential shape in Bi-Sr-Ca-Cu-O films

Author

Attanasio, C. ; Maritato, L. ; Coccorese, C. ; Prichepa, S.L. ; Lykov, A.N. ; Salvato, M.

Author_Institution

Dipartimento di Fisica, Salerno Univ., Italy

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1359

Lastpage

1362

Abstract

Transport measurements of the pinning potential for microbridges of polytextured thin films of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ (BSCCO) without externally applied magnetic field have been made. Experimental data have been analysed in the framework of classical Anderson-Kim flux creep model in the case of single isolated vortex. The obtained temperature dependence of the apparent pinning potential barrier has an anomalous behavior at T<0.7 T/sub c/. Such unusual temperature dependence of U/sub app/ can be explained both in terms of pinning energies distribution and spatially nonlinear pinning potential. The results of numerical simulations strongly prove the existence of washboard-type pinning potential with a distribution of critical current densities and shape potential.<>

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); flux creep; flux pinning; high-temperature superconductors; strontium compounds; superconducting microbridges; superconducting thin films; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/; anomalous behavior; classical Anderson-Kim flux creep model; critical current densities; high temperature superconductors; microbridges; numerical simulations; pinning potential shape; polytextured thin films; single isolated vortex; spatially nonlinear pinning potential; temperature dependence; transport measurements; washboard-type pinning potential; Bismuth compounds; Creep; Data analysis; Magnetic analysis; Magnetic field measurement; Magnetic films; Numerical simulation; Shape; Strontium; Temperature dependence;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402816

Filename

402816