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.

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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