Theory for underdoped high-T_c superconductors: effects of phase fluctuations

Details Theory for underdoped high-T_c superconductors: effects of phase fluctuations Theory for underdoped high-T_c superconductors: effects of phase fluctuations

1999-07-22

arxiv.org/abs/cond-mat/9907345v2

Physics

Condensed Matter

Superconductivity

(5 pages, 3 figures included, minor changes, to appear in JLTP proceedings MOS99)

Scientific paper

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.

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