Title :
Intrinsic critical current densities in high temperature superconducting films
Author :
Jiang, H. ; Widom, A. ; Huang, Y. ; Yuan, T. ; Vittoria, C.
Author_Institution :
Northeastern Univ., Boston, MA, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
The enhancement of the quantum electrodynamic tunneling process due to normal current dissipation is proposed to explain the measured Jc results for YBCO films. The authors calculate the depairing current density for YBCO to be on the order of 109 A/cm2 and an upper limit of Jc to be on the order of 107 A/cm2. The estimates of Jc are in reasonable agreement with measured values of Jc. The model has been extended to include current flow through small constrictions comparable to the penetration depth, and Jc was found to be inversely proportional to its cross sectional area
Keywords :
barium compounds; critical current density (superconductivity); high-temperature superconductors; penetration depth (superconductivity); superconducting thin films; superconductive tunnelling; yttrium compounds; YBaCuO; constrictions; critical current densities; cross sectional area; current dissipation; depairing current density; high-temperature superconductors; penetration depth; quantum electrodynamic tunneling process; superconducting films; Conductive films; Critical current density; Current density; Current measurement; Integrated circuit modeling; Superconducting films; Superconducting integrated circuits; Temperature; Tunneling; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
