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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2982
DTSTART:20130408T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T004710Z
LAST-MODIFIED:20130404T160813Z
LOCATION:5310 Chamberlin
SUMMARY:Fluctuation effects in disordered superconducting films above 
 Tc\, R. G. Herb Condensed Matter Seminar\, Alexander Finkelstein\, Wei
 zmann Institute of Science
DESCRIPTION:I will report on the fluctuation corrections in homogeneou
 sly disordered superconducting films.<br>
\n<br>
\nI will start with t
 he Nernst and Hall Effects where fluctuation corrections can be tracke
 d experimentally to temperatures more than order of magnitude above Tc
  and magnetic fields well above the upper critical field\, Hc2(0). The
 re is a quantitative agreement between our theoretical analysis and re
 cent data obtained in conventional superconductors for the Nernst Effe
 ct (K. Behnia\, France) and the Hall conductivity (Kapitulnik\, Stanfo
 rd) and for the Nernst Effect in certain high-Tc-family materials (L.T
 aillefer\, Canada).<br>
\n<br>
\nI will also report about our recent c
 alculation of the fluctuation corrections\, which is based on the Usad
 el equation in the real-time formulation. We adjust this approach to d
 erive analytic expressions for the corrections to the longitudinal con
 ductivity in the entire metallic part of the temperature-magnetic fiel
 d phase diagram. This method allows us to obtain fluctuation correctio
 ns in a compact and effective way\, establishing a direct connection b
 etween phenomenological and microscopic calculations.
URL:https://www.physics.wisc.edu/events/?id=2982
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