Abstract
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 self consistently. We present results for T c[n s, x], where x is the doping.
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Schäfer, F., Timm, C., Manske, D. et al. Theory for underdoped high-Tc superconductors: effects of phase fluctuations. Journal of Low Temperature Physics 117, 223–227 (1999). https://doi.org/10.1023/A:1022572322775
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DOI: https://doi.org/10.1023/A:1022572322775