Kosterlitz-Thouless vs. Ginzburg-Landau description of 2D superconducting fluctuations
Istituto Nazionale di Fisica della Materia e Dipartimento di Fisica, Università
di Roma "La Sapienza",
Piazzale A. Moro 2, 00185 Roma, Italy
Published online: 15 February 2000
We evaluate the charge and spin susceptibilities of the 2D attractive Hubbard model and we compare our results with Monte Carlo simulations on the same model. We discuss the possibility to include topological Kosterlitz-Thouless superconducting fluctuations in a standard perturbative approach substituting in the fluctuation propagator the Ginzburg-Landau correlation length with the Kosterlitz-Thouless correlation length.
PACS: 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.) / 74.72.-h – High-Tc compounds / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000