Unconventional superconductivity driven by Kondo-destruction quantum criticality

ORAL

Abstract

How quantum criticality affects superconductivity is a central issue in strongly correlated systems. Particularly pressing is for the beyond-Landau type quantum criticality, such as appearing in heavy fermion systems in the form of Kondo destruction [1]. This is exemplified by the heavy fermion superconductor CeRhIn5, which has an antiferromagnetic quantum critical point (QCP) accompanied by a sharp Fermi surface reconstruction, and in which d-wave superconductivity develops with a high Tc [2]. Here we address the pairing instabilities near a Kondo destruction QCP by studying the Anderson lattice model using the Cluster Extended-DMFT approach [3]. For extreme Ising anisotropic case, the paring susceptibility is significantly enhanced near the QCP. Whereas for SU(2) symmetric case, we find superconducting order around the QCP [4]; Tc is comparably high as compared with the observation in CeRhIn5 under optimal pressure. In both cases, we find the paring tendency to be stronger for the Kondo destruction type QCP than for the spin density wave type.
[1] Q. Si and F. Steglich, Science 329, 1161 (2010).
[2] T. Park et al., Nature 440,65 (2006);
[3] J. Pixley et al, PRB 91, 125127 (2015).
[4] A. Cai et al. (2018).

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Presenters

  • Ang Cai

    Department of Physics and Astronomy, Rice University, Rice University

Authors

  • Ang Cai

    Department of Physics and Astronomy, Rice University, Rice University

  • Jed Pixley

    Rutgers University, Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Department of Physics, Rutgers University, Center for Materials Theory, Rutgers University

  • Kevin Ingersent

    Department of Physics, University of Florida, University of Florida

  • Qimiao Si

    Rice University, Department of Physics and Astronomy, Rice University, Department of Physics and Astronomy, Houston, Texas 77005, USA, Rice University