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A d-wave, Eliashberg analysis of break junction and STM tunneling spectra onBiSrCaCuO (Bi2212) reveals that a spectral dip feature is directly linked tostrong electronic coupling to a narrow boson spectrum, evidenced by a largepeak in the boson spectral weight. The tunneling dip feature remains robust inthe overdoped regime of Bi2212 with bulk Tc values of 56 K-62 K. This iscontrary to recent optical conductivity measurements of the self-energy thatsuggest the narrow boson spectrum disappears in overdoped Bi2212 and thereforecannot be essential for the pairing mechanism. The discrepancy is resolved byconsidering the way each technique probes the electron self-energy, inparticular, the unique sensitivity of tunneling to the off-diagonal or pairingpart of the self-energy.Comment: RevTex4. 5 pages. 3 figures. Submitted to Physical Review Letter

physical review letters

Persistence of Strong Electron Coupling to a Narrow Boson Spectrum in Overdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>Tunneling Data

Persistence of Strong Electron Coupling to a Narrow Boson Spectrum in OverdopedBi2Sr2CaCu2O8+δTunneling Data