Abstract
A model of charged hole-pair bosons with long-range Coulomb interactions and very weak interlayer coupling is used to calculate the order parameter of underdoped cuprates. Model parameters are extracted from experimental superfluid densities and plasma frequencies. The temperature dependence T is characterized by a “trapezoidal” shape. At low temperatures, it declines slowly due to harmonic phase fluctuations which are suppressed by anisotropic plasma gaps. Above the single layer Berezinski-Kosterlitz-Thouless temperature, T falls rapidly toward the three-dimensional transition temperature. The theoretical curves are compared to c-axis superfluid density data by Kitano et al. J. Low Temp. Phys. 117, 1241 1999 and to the transverse nodal velocity measured by angular resolved photoemission spectra on BSCCO samples by Lee et al. Nature London 450, 81 2007 and by Kanigel et al. Phys. Rev. Lett. 99, 157001 2007 .
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