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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1507
DTSTART:20090430T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T181438Z
LAST-MODIFIED:20090422T213630Z
LOCATION:5310 Chamberlin
SUMMARY:Giant Nernst Effect due to Fluctuating Cooper Pairs in Superco
 nductors\, R. G. Herb Condensed Matter Seminar\, Andrei Varlamov\, INF
 M & CNR\, Italy\, Moscow Technological University\, Russia
DESCRIPTION:A theory of the fluctuation-induced Nernst effect is devel
 oped for arbitrary magnetic fields and temperatures beyond the upper c
 ritical field line in a two-dimensional superconductor. First\, we der
 ive a simple phenomenological formula for the Nernst coefficient\, whi
 ch naturally explains the giant Nernst signal due to fluctuating Coope
 r pairs. The latter is shown to be large even far from the transition 
 and may exceed by orders of magnitude the Fermi liquid terms. We also 
 present a complete microscopic calculation (which includes quantum flu
 ctuations) of the Nernst coefficient and give its asymptotic dependenc
 ies in various regions of the phase diagram. It is argued that the mag
 nitude and the behavior of the Nernst signal observed experimentally i
 n disordered superconducting films can be well understood on the basis
  of superconducting fluctuation theory.
URL:https://www.physics.wisc.edu/events/?id=1507
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