Thursday, January 31, 2008, 1:30 pm — Small seminar room, Bldg. 510
The precondition for the Berezinskii-Kosterlitz-Thouless transition in
thin superconducting films, the logarithmic intervortex interaction, is
satisfied at distances short relative to $\Lambda=2\lambda^2/d$,
$\lambda$ is the London penetration depth of the bulk material and $d$
is the film thickness.For this reason, the search for the transition
has been conducted in samples of the size $L<\Lambda$. It is argued
below that film edges turn the interaction into near exponential
(short-range) thus making the BKT transition impossible in
superconducting films on insulating substrates. If however the substrate
is superconducting and separated from the film by an insulated layer,
the logarithmic intervortex interaction is recovered and the BKT
transition should be observable.
Hosted by: I. Bozovic
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