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

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Title		Scanning Tunneling Spectroscopy of Bi₂Sr₂CuO_6+δ: New Evidence for the Common Origin of the Pseudogap and Superconductivity
Authors		Kugler, Martin Fischer, Oystein Renner, Christoph Ono, S. Ando, Yoichi
Published in		Physical Review Letters. 2001, vol. 86, no. 21, p. 4911-4914
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.
Identifiers		DOI: 10.1103/PhysRevLett.86.4911
Full text		Article (Published version) (558 Kb) - Free access
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation (ISO format)		KUGLER, Martin et al. Scanning Tunneling Spectroscopy of Bi₂Sr₂CuO_6+δ: 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 https://archive-ouverte.unige.ch/unige:35917