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- W137641648 abstract "Remarkable anisotropic structures have been recently observed in the order parameter Delta_k of the underdoped superconductor Bi-2212. Such findings are strongly suggestive of deviations from a simple d_{x^2 - y^2}-wave picture of high-Tc superconductivity, i.e. Delta_k ~ cos (k_x) - cos (k_y). In particular, flatter nodes in Delta_k are observed along the k_x = (+/-) k_y directions in k-space, than within this simple model for a d-wave gap. We argue that nonlinear corrections in the k-dependence of Delta_k near the nodes introduce new energy scales, which would lead to deviations in the predicted power-law asymptotic behaviour of several measurable quantities, at low or intermediate temperatures. We evaluate such deviations, either analytically or numerically, within the interlayer pair-tunneling model, and within yet another phenomenological model for a d-wave order parameter. We find that such deviations are expected to be of different sign in the two cases. Moreover, the doping dependence of the flatness of the gap near the nodes is also attributable to Fermi surface effects, in addition to possible screening effects modifying the in-plane pairing kernel, as recently proposed." @default.
- W137641648 created "2016-06-24" @default.
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- W137641648 date "2000-05-01" @default.
- W137641648 modified "2023-10-18" @default.
- W137641648 title "Extended -wave superconductivity. Flat nodes in the gap and the low-temperature asymptotic properties of high- superconductors" @default.
- W137641648 doi "https://doi.org/10.1007/pl00011041" @default.
- W137641648 hasPublicationYear "2000" @default.
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