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Photoemission spectra of the high temperature superconductor Bi2212 near(pi,0) show a dramatic change when cooling below Tc: the broad peak in thenormal state turns into a sharp low energy peak followed by a higher bindingenergy hump. Recent experiments find that this low energy peak persists over asignificant range in momentum space. We show in this paper that these data arewell described by a simple model of electrons interacting with a collectivemode which appears only below Tc.Comment: 4 pages, revtex, 4 encapsulated postscript figure

physical review. b, condensed matter

Collective modes and the superconducting-state spectral function of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></…

Collective modes and the superconducting-state spectral function ofBi2Sr2CaCu