Universality of scanning tunneling microscopy on cuprate superconductors

ORAL

Abstract

We consider the problem of local tunneling into cuprate superconductors, combining model based calculations for the superconducting order parameter with wavefunction information obtained from first principles electronic structure. We use a recently developed Wannier function based method to calculate topographies, spectra, conductance maps and normalized conductance maps close to impurities. We find that it is the local planar Cu d_{x^2-y^2} Wannier function, qualitatively similar for many systems several Angstrom above the surface, that controls the form of the tunneling spectrum and the spatial patterns near perturbations. In particular, we discuss why STM results on BSCCO and NaCCOC are essentially identical.

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Presenters

  • Peter Hirschfeld

    Department of Physics, University of Florida, University of Florida, Univ of Florida - Gainesville, University of Florida - Gainesville, PHYSICS, UNIVERSITY OF FLORIDA

Authors

  • Peter Hirschfeld

    Department of Physics, University of Florida, University of Florida, Univ of Florida - Gainesville, University of Florida - Gainesville, PHYSICS, UNIVERSITY OF FLORIDA

  • Peayush Choubey

    Indian Institute of Science, Univ of Florida - Gainesville

  • Andreas Kreisel

    university of Leipzig, Physics, University of Leipzig, Faculty of Physics and Earth Sciences, Universität Leipzig, University of Leipzig

  • Tom Berlijn

    Oak Ridge National Lab, Center for Nanophase Materials Sciences, Oak Ridge National Lab, CNMS, Oak Ridge National Lab, Oak Ridge National Laboratory

  • BRIAN ANDERSEN

    Niels Bohr Institute, University of Copenhagen, Niels Bohr Inst, Physics, Neils Bohr Institute