Hybridization in Kondo lattice heavy fermions via quasiparticle scattering spectroscopy (QPS)

ORAL

Abstract

Band renormalization in a Kondo lattice via hybridization of the conduction band with localized states has been a hot topic over the last several years. In part, this has to do with recently reignited interest in the hidden order problem in URu$_{2}$Si$_{2}$. Despite recent developments regarding the electronic structure in this compound, it remains to be resolved whether the hidden order phase transition is related to the opening of a hybridization gap. Our quasiparticle scattering spectroscopy (QPS) has shown they are not related directly [1]. This can be understood naturally since in principle band renormalization does not involve symmetry breaking. To deepen our understanding, we extend to other Kondo lattice compounds. For instance, when applied to YbAl$_{3}$, a vegetable heavy-fermion system, QPS reveals conductance signatures for hybridization in a Kondo lattice such as asymmetric Fano background along with characteristic energy scales. Presenting new results on these materials, we will discuss a broader picture.\\[4pt] [1] W. K. Park \textit{et al}., PRL \textbf{108}, 246403 (2012).

*The work at UIUC is supported by the NSF DMR 12-06766, the work at LANL is carried out under the auspices of the U.S. DOE, Office of Science, and the work done at Ames Lab. was supported under Contract No. DE-AC02-07CH11358.

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Authors

  • Sanjay Narasiwodeyar

    • Univ of Illinois - Urbana

  • Matt Dwyer

    • Univ of Illinois - Urbana

  • Laura Greene

    • University of Illinois at Urbana-Champaign
    • Department of Physics and Materials Research Laboratory, Center for Emergent Superconductivity, University of Illinois at Urbana-Champaign
    • Univ of Illinois - Urbana

  • Wan Kyu Park

    • University of Illinois at Urbana-Champaign
    • Univ of Illinois - Urbana

  • Eric D. Bauer

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Los Alamos National laboratory, Los Alamos, NM, 87544, USA

  • Paul Tobash

    • Los Alamos National Laboratory

  • Ryan E. Baumbach

    • Los Alamos National Laboratory
    • Department of Physics, University of California, San Diego, La Jolla, California 92093

  • Filip Ronning

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Los Alamos National laboratory, Los Alamos, NM, 87544, USA

  • John Sarrao

    • Los Alamos National Laboratory

  • J. Thompson

    • Los Alamos National Laboratory
    • Los Alamos Natl Lab

  • Paul C. Canfield

    • Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, U.S.A.
    • Iowa State University, Ames Lab
    • Ames Laboratory/ Iowa State University
    • Iowa State University
    • Ames Laboratory
    • Iowa State Univ
    • Ames Laboratory and Dept. of Physics, Iowa State University
    • The Ames Laboratory, Ames, IA 50011, USA
    • Ames Lab, Department of Physics, Iowa State University
    • The Ames Laboratory, Iowa State University, Ames, USA
    • Ames Laboratory and Dept. of Physics and Astronomy, Iowa State University