Physics – Condensed Matter – Superconductivity
Scientific paper
2006-10-22
Physical Review B (Rapid Communications) 75, 140510(R) (2007)
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures
Scientific paper
10.1103/PhysRevB.75.140510
We report high-resolution spectra of the second derivative -d^{2}(Re\Sigma)/d\omega^{2} of the real part of electron self-energy \Sigma along the diagonal direction (where \omega = E_{F}-E - \Delta_{D} and \Delta_{D} is the diagonal superconducting gap) for a nonsuperconducting La_{1.97}Sr_{0.03}CuO_{4} (LSCO) crystal and a superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+y} (BSCCO) crystal with T_{c} = 91 K. The -d^{2}(Re\Sigma)/d\omega^{2} spectrum of the nonsuperconducting LSCO shows clear peak features, which match precisely with those in the phonon density of states obtained from neutron scattering. Similarly, if we assign \Delta_{D} = 7\pm1 meV for the superconducting BSCCO, the peak features in -d^{2}(Re\Sigma)/d\omega^{2} of this compound also match precisely with those in the phonon density of states and the tunneling spectrum. The present results rule out seemingly well accepted d-wave gap symmetry and strongly support an extended s-wave gap symmetry with eight line nodes.
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