Temperature Dependence Of Cuprate Superconductors' Order Parameter

Details Temperature Dependence Of Cuprate Superconductors' Order Parameter Temperature Dependence Of Cuprate Superconductors' Order Parameter

2009-07-27

arxiv.org/abs/0907.4768v1

Phys. Rev. B 80, 134521 (2009).

Physics

Condensed Matter

Superconductivity

9 pages, 5 figures

Scientific paper

A model of charged hole-pair bosons, with long range Coulomb interactions and very weak interlayer coupling, is used to calculate the order parameter -Phi- of underdoped cuprates. Model parameters are extracted from experimental superfluid densities and plasma frequencies. The temperature dependence -Phi(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 (BKT) temperature, Phi(T) falls rapidly toward the three dimensional transition temperature. The theoretical curves are compared to c-axis superfluid density data by H. Kitano et al., (J. Low Temp. Phys. 117, 1241 (1999)) and to the -transverse nodal velocity- measured by angular resolved photoemmission spectra on BSCCO samples by W.S. Lee et al., (Nature 450, 81 (2007)), and by A. Kanigel, et al., (Phys. Rev. Lett. 99, 157001 (2007)).

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