Dynamic Critical Fluctuation of Superconductivity Order Parameter above the Transition Point
Open Access
- 1 February 1969
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 41 (2) , 296-306
- https://doi.org/10.1143/PTP.41.296
Abstract
Dynamic correlation function of fluctuation field in a dirty superconductor is investigated above the transition point. It is determined self-consistently in the critical range of temperature where the mean field theory breaks down and interactions among fluctuation modes must be taken into account. Correlation function is of diffusional type with a diffusion constant which becomes singular as (T/Tc-1)1(4/d) where d is dimensionality. The inverse correlation length is proportional to (T/Tc-1)2/d and is independent of mean free path of electron. Electrical conductivity of a bulk system in the critical range contains a term which increases like (T/Tc-1)-1/3 and which is independent of mean free path. However in a case of a film system a problem arises.Keywords
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