Physics – Condensed Matter – Superconductivity
Scientific paper
2005-10-03
Physics
Condensed Matter
Superconductivity
RevTex4. 5 pages. 3 figures. Submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.96.017004
A d-wave, Eliashberg analysis of break junction and STM tunneling spectra on BiSrCaCuO (Bi2212) reveals that a spectral dip feature is directly linked to strong electronic coupling to a narrow boson spectrum, evidenced by a large peak in the boson spectral weight. The tunneling dip feature remains robust in the overdoped regime of Bi2212 with bulk Tc values of 56 K-62 K. This is contrary to recent optical conductivity measurements of the self-energy that suggest the narrow boson spectrum disappears in overdoped Bi2212 and therefore cannot be essential for the pairing mechanism. The discrepancy is resolved by considering the way each technique probes the electron self-energy, in particular, the unique sensitivity of tunneling to the off-diagonal or pairing part of the self-energy.
Coffey L.
Gray Kenneth E.
Hinks D. G.
Kendziora Chris
Ozyuzer Lutfi
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