Physics – Condensed Matter – Superconductivity
Scientific paper
1997-10-29
Physics
Condensed Matter
Superconductivity
3 pages, LaTex, to be published in J.Phys.Chem.Solids, 1997, SNS Conf., Cape Cod
Scientific paper
10.1016/S0022-3697(98)00185-1
The electromagnetic response of the CuO2-planes is calculated within a strong coupling theory using model tight binding bands and momentum dependent pairing interactions representing spin fluctuations and phonon exchange. The superconducting state resulting from these interactions has d-wave symmetry. With phonon exchange included the order parameter amplitude grows rapidly below Tc at elevated frequencies which leads to improved agreement with the observed temperature dependence of the penetration depth. Good agreement between theory and experiment can only be achieved if it is assumed that the strength of the quasiparticle interaction decreases with temperature in the superconducting state. The amount of this reduction depends sensitively on the momentum dependence of the interactions, the energy dispersion and the position of the Fermi line.
Bille Andreas
Scharnberg Kurt
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