High-energy kink in high-temperature superconductors

ORAL

Abstract

Photoemission studies show the presence of a high energy anomaly in the observed band dispersion for two families of cuprate superconductors, Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{4+\delta }$and La$_{2-x}$Ba$_{x}$CuO$_{4}$. The anomaly, which occurs at a binding energy of approximately 340 meV, is found to be doping and momentum independent. The magnitude of the effect is momentum dependent. Scattering from short range or nearest neighbour spin excitations is found to supply an adequate description of the observed phenomena.

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Authors

  • Peter Johnson

    • Brookhaven National Laboratory
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973

  • T. Valla

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973

  • Tim Kidd

    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973

  • W.G Yin

    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973

  • Genda Gu

    • Brookhaven National Laboratory
    • 1. Brookhaven National Laboratory, USA
    • Physics Department, Brookhaven National Laboratory, Upton, New York 11973
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973

  • Z-H Pan

    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

  • Alexei Fedorov

    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.