Evidence of strong correlations at the van Hove singularity in the scanning tunneling spectra of superconducting Bi₂Sr₂CaCu₂O_8+δ single crystals

2012/05/24 by Jouko Nieminen, Ilpo Suominen, Nieminen, Jouko +7 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.1205.5540

11 pages, 8 figures, accepted for publication in Phys. Rev. B

arxiv created 2012/05/24 · arxiv updated 2012/05/25

Abstract

We present realistic multiband calculations of scanning tunneling spectra in Bi₂Sr₂CaCu₂ O_8+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.

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