1/3/2004
l Critical current
density
voltage drop
PINNING
Pinning
center=
hole,
impurity, etc.
* If
vortices are PINNED - Superconductivity restored
Moving
vortices
a
Y=0
FL =Fp
a Jc
·
J<
Jc - Pinned - no
dissipation
·
J>Jc - unpinned
Pinning Force per unit length