Effects of disordered Ru substitution in BaFe$_2$As$_2$: possible superdiffusion mechanism in real materials

ORAL

Abstract

An unexpected insensitivity of the Fermi surface to impurity scattering is found in Ru substituted BaFe$_2$As$_2$ from first-principles theory, offering a natural explanation of the unusual resilience of transport and superconductivity to a high level of disordered substitution in this material. This robustness is shown to originate from a coherent interference of correlated on-site and inter-site impurity scattering, similar in spirit to the microscopic mechanism of superdiffusion in one dimension. Our result also demonstrates a strong substitution dependence of the Fermi surface and carrier concentration, and provides a natural resolution to current discrepancies in recent photoelectron spectroscopy. These effects offer a natural explanation of the diminishing long-range magnetic, orbital and superconducting order with high substitution.

*Work supported by DOE DE-AC02-98CH10886 and DOE CMCSN

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Authors

  • Limin Wang

    • Brookhaven National Lab

  • Tom Berlijn

    • University of Florida
    • Brookhaven National Lab

  • Yan Wang

    • University of Florida
    • Department of Physics, University of Florida, Gainesville, Florida 32611, USA

  • Chia-Hui Lin

    • Brookhaven National Laboratory / Stony Brook University
    • Brookhaven National Lab, State university of New York, Stony Brook

  • Peter Hirschfeld

    • Department of Physics, University of Florida, Gainesville, FL
    • Department of Physics, University of Florida, Gainesville, Florida 32611, USA
    • University of Florida
    • Department of Physics, University of Florida, Gainesville, FL 32611-8440, USA
    • Univ. Florida

  • Wei Ku

    • Brookhaven National Laboratory
    • Brookhaven National Laboratory / Stony Brook University
    • Brookhaven National Lab, State university of New York, Stony Brook