Figure 3: Spectral properties of strongly overdoped Bi-2201 (Tc<1.8 K) measured at 5 K.
From: First direct observation of the Van Hove singularity in the tunnelling spectra of cuprates
(a) Distribution of Ep values for single-peak spectra (red part of the histogram corresponds to the position of the single peak) and gapped spectra (green part of the histogram). (b) Representative spectra showing single peak at positive energy (top), single peak at negative energy and gapped structures. This series was obtained by ordering the spectra according to the position of their maximum. (c) Interpretation of b as a transition from the pseudogap to the normal state. T*, the frontier between normal and pseudogap states.
