Title :
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
fDate :
6/1/1995 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
