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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1645
DTSTART:20091008T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T030812Z
LAST-MODIFIED:20091005T130800Z
LOCATION:5310 Chamberlin
SUMMARY:Transport properties of superconductors near critical temperat
 ure: conductivity\, magneto-tunneling\, noise and relaxation\, R. G. H
 erb Condensed Matter Seminar\, Alex Levchenko\, Argonne National Lab
DESCRIPTION:We study fluctuation effects on transport properties of su
 perconductors (thin films and tunnel junctions) above the transition t
 emperature. The exact frequency dependence of the electron phase relax
 ation time due to dynamical superconducting fluctuations is important 
 in this regime. It strongly modifies temperature and magnetic field de
 pendence of conductivity\, tunneling conductance and noise. A new ener
 gy scale appears as the result of these fluctuation effects\, which pr
 ovides a natural reqularization to Maki-Thompson conductivity and lead
 s to peculiar non-monotonous temperature dependence of tunneling condu
 ctance. We make a comparative analysis of diffusive and ballistic regi
 mes in the context of tunneling and go beyond the standard paradigm of
  density of states related effects. Noise measurement may be a powerfu
 l tool for probing superconductive fluctuations\, since spectral funct
 ion of current fluctuations exhibits a distinct feature at the Josephs
 on frequency and its magnitude is strong function of temperature.
URL:https://www.physics.wisc.edu/events/?id=1645
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