Superconductivity in the Pseudogap State due to Fluctuations of Short-Range Order
Abstract
We analyze the anomalies of superconducting state (s and d-wave pairing) in a simple model of pseudogap state, induced by fluctuations of short - range order (e.g. antiferromagnetic), based on the model Fermi surface with "hot patches". We derive a system of recursion relations for Gorkov's equations which take into account all diagrams of perturbation theory for electron interaction with fluctuations of short-range order. Then we find superconducting transition temperature and gap behavior for different values of the pseudogap width and correlation lengths of short-range order fluctuations. In a similar approximation we derive the Ginzburg-Landau expansion and study the main physical characteristics of a superconductor close to the transition temperature, both as functions of the pseudogap width and correlation length of fluctuations. Results obtained are in qualitative agreement with a number of experiments on underdoped HTSC-cuprates.
Cite
@article{arxiv.cond-mat/0008377,
title = {Superconductivity in the Pseudogap State due to Fluctuations of Short-Range Order},
author = {E. Z. Kuchinskii and M. V. Sadovskii},
journal= {arXiv preprint arXiv:cond-mat/0008377},
year = {2009}
}
Comments
18 pages, 12 figures, RevTeX 3.0, minor misprints corrected, to appear in JETP