First direct observation of the Van Hove singularity in the tunneling spectra of cuprates

Abstract

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.

arXiv comment4 pages, 4 figures

References in corpus (16)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
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• Modeling scanning tunneling spectra of $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$
• Preeminent role of the Van Hove singularity in the strong-coupling analysis of scanning tunneling spectroscopy for two-dimensional cuprates
• Superconducting coherence peak in the electronic excitations of a single layer cuprate superconductor $B{i}_{2}S{r}_{1.6}L{a}_{0.4}Cu{O}_{6+\delta }$
• Imaging the essential role of spin-fluctuations in high-Tc superconductivity
• Effect of oxygen-doping on Bi-2223 vortex matter: Crossover from electromagnetic to Josephson interlayer coupling
• Effect of oxygen-doping on Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$ vortex matter: Crossover from electromagnetic to Josephson interlayer coupling
• Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ crystals

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• Strong-coupling analysis of scanning tunneling spectra in Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$
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• The study of electronic nematicity in an overdoped (Bi, Pb)${}_2$Sr${}_2$CuO${}_{6+\delta }$ superconductor using scanning tunneling spectroscopy
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