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On details of the thermodynamical derivation of the Ginsburg--Landau equations

Research paper by A. V. Dmitriev, W. Nolting

Indexed on: 03 Dec '03Published on: 03 Dec '03Published in: Physics - Superconductivity



Abstract

We examine the procedure of thermodynamical derivation of the Ginsburg--Landau equation for current, which is given unclear and contradictory interpretations in existing textbooks. We clarify all steps of this procedure and find as a consequence a limitation on the validity range of the thermodynamic Ginsburg--Landau theory, which does not seem to be explicitely stated up to now: we conclude that the thermodynamic theory is applicable only to a superconducting specimen that is not a part of an external current-carrying loop.