Scanning Tunneling Spectroscopy of Bi<sub>2</sub>Sr<sub>2</sub>CuO<sub>6+δ</sub>: New Evidence for the Common Origin of the Pseudogap and Superconductivity
- Kugler, Martin
- Fischer, Oystein
- Renner, Christoph
- Ono, S.
- Ando, Yoichi
Publication date
January 2001
DOI Publisher
American Physical Society (APS)Abstract
Using scanning tunneling spectroscopy, we investigated the temperature dependence of the quasiparticle density of states of overdoped Bi2Sr2CuO6+δ between 275 mK and 82 K. Below Tc=10K, the spectra show a gap with well-defined coherence peaks at ±Δp≃12meV, which disappear at Tc. Above Tc, the spectra display a clear pseudogap of the same magnitude, gradually filling up and vanishing at T∗≃68K. The comparison with Bi2Sr2CaCu2O8+δ demonstrates that the pseudogap and the superconducting gap scale with each other, providing strong evidence that they have a common origin
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