Abstract：
:In two-dimensional (2D) 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 tunnelling 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 tunnelling spectra. In this study, we show for the first time that the VHS is unambiguously observed in STM measurements performed on the cuprate Bi₂Sr₂CuO(₆+δ) (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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Piriou A,Jenkins N,Berthod C,Maggio-Aprile I,Fischer Odoi
10.1038/ncomms1229subject
Has Abstractpub_date
2011-01-01 00:00:00pages
221issn
2041-1723pii
ncomms1229journal_volume
2pub_type
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