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Scanning Tunneling Spectroscopy of Bi2Sr2CuO6+δ: New Evidence for the Common Origin of the Pseudogap and Superconductivity

Published inPhysical review letters, vol. 86, no. 21, p. 4911-4914
Publication date2001

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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KUGLER, Martin et al. 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. In: Physical review letters, 2001, vol. 86, n° 21, p. 4911–4914. doi: 10.1103/PhysRevLett.86.4911
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ISSN of the journal0031-9007

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