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TYPE II SUPERCONDUCTOR :
k=l /x>1.4
0<H<H
C1
MEISSNER STATE
H
C1
<H<H
C2
MIXED STATE
H
C2
<H
NORMAL STATE
H
FILAMENT OF MAGNETIC FLUX
=VORTEX
F
0
=
hc/2e= 2
x10
-
7
G cm
2
REVIEWS
l
Blatter
et al., Rev. Mod. Phys.
66,
1125 (1994)
l
Tinkham "Superconductivity"