ZhETF, Vol. 119,
p. 595 (March 2001)
(English translation - JETP,
Vol. 92, No. 3,
available online at www.springer.com
NONLINEAR FLUCTUATION PHENOMENA IN THE TRANSPORT PROPERTIES OF SUPERCONDUCTORS
Larkin A.I., Ovchinnikov Yu.N.
Received: September 28, 2000
There exists a wide temperature region , where the influence of fluctuations on the thermodynamic properties of superconductors can be taken into account in the linear (Gaussian) approximation, while their influence on the kinetic properties is strongly nonlinear. The Maki-Thompson cotribution to the conductivity saturates in this region. However, the Aslamazov-Larkin contribution becomes even more singular. This enhancement is related to the fact that nonlinear effects increase the lifetime of fluctuating pairs. Pair-breaking and energy relaxation processes can decrease the nonlinear effects.