Low-Magnetic Field Critical Behavior in Strongly Type-II Superconductors
Abstract
A new description is proposed for the low-field critical behavior of type-II superconductors. The starting point is the Ginzburg-Landau theory in presence of an external magnetic field H. A set of fictitious vortex variables and a singular gauge transformation are used to rewrite a finite H Ginzburg-Landau functional in terms of a complex scalar field of zero average vorticity. The continuum limit of the transformed problem takes the form of an H = 0 Ginzburg-Landau functional for a charged field coupled to a fictitious `gauge' potential which arises from long wavelength fluctuations in the background liquid of field-induced vorticity. A possibility of a novel phase transition involving zero vorticity degrees of freedom and formation of a uniform condensate is suggested. A similarity to the superconducting [Higgs] electrodynamics and the nematic-smectic-A transition in liquid crystals is noted. The experimental situation is discussed.
Cite
@article{arxiv.cond-mat/9505126,
title = {Low-Magnetic Field Critical Behavior in Strongly Type-II Superconductors},
author = {Zlatko Tesanovic},
journal= {arXiv preprint arXiv:cond-mat/9505126},
year = {2009}
}
Comments
19 pages RevTeX, one figure available by fax [email requests to [email protected]], to appear in Physical Review B1