Physics – Condensed Matter – Superconductivity
Scientific paper
1997-01-23
Phys. Rev. Lett. 78 (1997) 4891
Physics
Condensed Matter
Superconductivity
1 page revtex plus 1 postscript figure
Scientific paper
10.1103/PhysRevLett.78.4891
In a recent paper Kendziora et al concluded that the superconducting gap in overdoped Bi-2212 is isotropic. From data obtained from electronic Raman scattering measurements, their conclusion was based on the observation that pair breaking peaks occured at approximately the same frequency in different scattering geometries and that the normalized scattering intensity at low energies was strongly depleted. We discuss a different interpretation of the raw data and present new data which is consistent with a strongly anisotropic gap with nodes. The spectra can be successfully described by a model for Raman scattering in a d_{x^{2}-y^{2}} superconductor with spin fluctuations and impurity scattering included.
Chen Xue-Kun
Devereaux T.
Hewitt Kenneth
Irwin J. C.
Naeini J.
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