Pairing correlation near Kondo-destruction quantum criticality

POSTER

Abstract

How quantum criticality affects superconductivity is a central issue in strongly correlated systems. Particularly pressing is for the beyond-Landau quantum criticality, such as appearing in heavy fermion systems in the form of Kondo destruction [1]. In addition, the superconducting Tc in systems such as Ce-115 is high as measured by the Fermi temperature. Thus motivated, we address the pairing instabilities near a Kondo destruction quantum critical point (QCP). We study the cluster Bose-Fermi Anderson model and, using the Cluster Extended-DMFT approach, the Anderson lattice model. We have identified a Kondo destruction QCP between a heavy Fermi liquid and an antiferromagnetic metal phase, and demonstrated enhanced pairing correlations in its vicinity [2]. We also analyze the dependence of this effect on the spin anisotropy. Implications of our results for Ce-115 systems is discussed.

[1] Q. Si and F. Steglich, Science 329, 1161 (2010).
[2] A. Cai et al., to be published.

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Presenters

  • Ang Cai

    Rice Universiry, Rice University

Authors

  • Ang Cai

    Rice Universiry, Rice University

  • Jed Pixley

    Physics, Rutgers University, Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers University, Rutgers University, Physics, Rutgers

  • Kevin Ingersent

    Physics, Univ of Florida - Gainesville, Department of Physics, University of Florida, University of Florida

  • Qimiao Si

    Department of Physics and Astronomy, Rice University, Physics and Astronomy, Rice Univ, Physics and Astronomy, Rice University, Rice Univ, Rice Universiry, Physics, Rice University, Rice University, Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Physics and Astronomy, and Rice Center for Quantum Materials, Rice University, Department of Physics and Astronomy, Rice Univ