1/3/2004
77
MODEL OF VORTEX ORDERING
I
o
<I < I*
l
Measured
I
c
= I*
z
disordered state contiguous.
l
V=0
z
Vortex motion too small to measure
.
.
*
Nucleation of ordered phase
at
edges
z
current spreads to interior of
sample
t < t
d
t = t
d
t > t
d
l
I
o
< I
c
~I
l
V>0
z
Vortices
flow across sample
*
First
Channel connects sample edges.
l
I
c
= I
o
l
Slope of I-V
increases with time
*
More
Channels form
z
ordered state
engulfs sample.
I
I
I