Title :
Anisotropic current transport properties and their scaling in multifilamentry Bi-2223 Ag-sheathed tapes
Author :
Kiss, Takanobu ; Okamoto, Hiroshi
Author_Institution :
Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
Using a statistic E-J model describing percolative current transport properties, we analyzed pinning strength, its distribution and angular dependence of Bi-2223 Ag sheathed tapes. It has been shown that the anisotropy can be attributed to angular dependence of the depinning transition field, and a scaling holds with respect to the pinning force density. The angular dependence of the transition field can be described precisely by an extended Tinkham 2D model taking into account misalignment angle of the filaments. We derive an analytical expression describing the magnetic field and angular dependence of Jc and n value of the tape. It allows us to predict the angular dependence of the transport properties using only limited data set, i.e., (1) magnetic field dependence in perpendicular field and (2) anisotropic ratio of the transition fields between perpendicular and parallel configuration
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; multifilamentary superconductors; percolation; silver; strontium compounds; Bi2Sr2Ca2Cu3O10 -Ag; angular dependence; anisotropic current transport properties; anisotropic ratio; depinning transition field; extended Tinkham 2D model; high temperature superconductor; magnetic field; magnetic field dependence; misalignment angle; multifilamentry Bi-2223 Ag-sheathed tapes; percolative current transport properties; pinning force density; pinning strength; scaling; statistic E-J model; Anisotropic magnetoresistance; Critical current; High temperature superconductors; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic properties; Multifilamentary superconductors; Statistical analysis; Statistical distributions;
Journal_Title :
Applied Superconductivity, IEEE Transactions on