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.

4 pages, 4 figures

References in corpus (8)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Imaging the impact on cuprate superconductivity of varying the inter-atomic distances within individual crystal unit-cells
• Imaging nanoscale Fermi surface variations in an inhomogeneous superconductor
• Enhancement of electronic inhomogeneities due to out-of-plane disorder in Bi_2Sr_2CuO_{6+delta} superconductors observed by scanning tunneling spectroscopy
• 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 $B{i}_{2}S{r}_{1.6}L{a}_{0.4}Cu{O}_{6+\delta }$
• 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

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• Realization of a hole-doped Mott insulator on a triangular silicon lattice
• Dual parquet scheme for the two-dimensional Hubbard model: modelling low-energy physics of high-$T_c$ cuprates with high momentum resolution
• Puddle formation, persistent gaps, and non-mean-field breakdown of superconductivity in overdoped (Pb,Bi)2Sr2CuO6+δ
• The discovery of three-dimensional Van Hove singularity
• Quasiparticle interference and charge order in a heavily overdoped non-superconducting cuprate
• Transport properties and doping evolution of the Fermi surface in cuprates
• Universal relations between thermoelectrics and noise in mesoscopic transport across a tunnel junction
• Low-dimensionality-induced tunable ferromagnetism in SrRuO${}_3$ ultrathin films