Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-04
Nature Communications 2:221 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
10.1038/ncomms1229
In two-dimensional lattices the electronic levels are unevenly spaced, and the density of states (DOS) displays a logarithmic divergence known as the Van Hove singularity (VHS). This is the case in particular for the layered cuprate superconductors. The scanning tunneling microscope (STM) probes the DOS, and is therefore the ideal tool to observe the VHS. No STM study of cuprate superconductors has reported such an observation so far giving rise to a debate about the possibility of observing directly the normal state DOS in the tunneling spectra. In this study, we show for the first time that the VHS is unambiguously observed in STM measurements performed on the cuprate Bi-2201. Beside closing the debate, our analysis proves the presence of the pseudogap in the overdoped side of the phase diagram of Bi-2201 and discredits the scenario of the pseudogap phase crossing the superconducting dome.
Berthod Christophe
Fischer Øystein
Jenkins Nancy
Maggio-Aprile Ivan
Piriou Alex
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