In underdoped cuprates, T_c is thought to be determined by Cooper pair phase fluctuations because of the small superfluid density n_s. Experimentally, T_c is found to scale with n_s. The fluctuation-exchange approximation (FLEX) in its standard form fails to predict this behavior of T_c since it does not include phase fluctuations. We therefore extend the FLEX to include them selfconsistently. We present results for T_c[n_s,x], where x is the doping.
@article{arxiv.cond-mat/9907345,
title = {Theory for underdoped high-T_c superconductors: effects of phase fluctuations},
author = {F. Schaefer and C. Timm and D. Manske and K. H. Bennemann},
journal= {arXiv preprint arXiv:cond-mat/9907345},
year = {2007}
}
Comments
(5 pages, 3 figures included, minor changes, to appear in JLTP proceedings MOS99)