Superconducting Gap Nodal Surface and Fermi Surface: their partial overlap in cuprates

Details Superconducting Gap Nodal Surface and Fermi Surface: their partial overlap in cuprates Superconducting Gap Nodal Surface and Fermi Surface: their partial overlap in cuprates

1995-02-02

arxiv.org/abs/cond-mat/9502007v2

Physics

Condensed Matter

RevTeX 3.0, 4 Pages, 6 PostScript Figures.

Scientific paper

10.1142/S0217984995001224

Electron correlation in cuprates leads to a global constraint $\sum_{\bf k} \Delta_{\bf k} = 0$ on the gap function $\Delta_{\bf k}$ resulting in a gap nodal surface. We give physical arguments supported by numerical results and discuss some experimental results to argue that correlations also lead to a local constraint on charge fluctuations in ${\bf k}$-space close to the Fermi surface, which may result in a substantial overlap of the Fermi surface with the gap nodal surface.

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