Evidence of strong correlations at the van Hove singularity in the scanning tunneling spectra of superconducting Bi2Sr2CaCu2O8+δ single crystals

Jouko Nieminen; Ilpo Suominen; Tanmoy Das; R. S. Markiewicz; A. Bansil

doi:10.1103/PhysRevB.85.214504

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Evidence of strong correlations at the van Hove singularity in the scanning tunneling spectra of superconducting Bi2Sr2CaCu2O8+δ single crystals

Jouko Nieminen, Ilpo Suominen, Tanmoy Das, R. S. Markiewicz, A. Bansil

DOI 10.1103/PhysRevB.85.214504 · Physical Review B

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Abstract

We present realistic multiband calculations of scanning tunneling spectra in Bi2Sr2CaCu2O8+δ over a wide doping range. Our modeling incorporates effects of a competing pseudogap and pairing gap as well as effects of strong electronic correlations, which are included by introducing self-energy corrections in the one-particle propagators. The calculations provide a good description of the two-gap features seen in experiments at low energies and the evolution of the van Hove singularity (VHS) with doping, and suggest a possible quantum critical point near the point where the VHS crosses the Fermi level.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93	Pressure not reported	unknown