Sequential Localization and Strange-metal Behavior in a Multipolar Kondo System

ORAL

Abstract

Quantum criticality and beyond-Landau physics of Kondo destruction [1,2] in heavy fermion systems with multipolar degrees of freedom is attracting considerable interest. Recent experiments on the heavy fermion compound Ce3Pd20Si6 show evidence of two consecutive Fermi surface collapsing quantum critical points (QCP) as it is tuned from a paramagnetic to an antiferroquadrupolar (AFQ) and then to an antiferromagnetic (AFM) state [3]. We are able to understand this behavior by advancing a theory of sequential destruction of an SU(4) spin-orbital-coupled Kondo entanglement in an SU(4) Bose-Fermi Kondo model, which represents an effective model for a multipolar Kondo lattice system with Kugel–Khomskii interaction. As a function of coupling strength to the bosonic bath, we find that a generic trajectory in the parameter space contains two QCPs associated with the Kondo destruction of the orbital and spin degrees of freedom, respectively. For a Kondo lattice, this corresponds to two stages of Fermi surface jump, thus providing a natural understanding of the experimental findings.
[1] Q. Si et al., Nature 413, 804 (2001).
[2] S. Paschen et al., Nature 432, 881 (2004).
[3] V. Martelli, A. Cai, et al., arXiv:1709.09376.

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Presenters

  • Silke Paschen

    Vienna University of Technology

Authors

  • Silke Paschen

    Vienna University of Technology

  • Ang Cai

    Department of Physics and Astronomy, Rice University, Rice University

  • Emilian Nica

    University of British Columbia, Department of Physics, Arizona State University, Department of Physics and Astronomy, University of British Columbia, Arizona State University

  • Chia-Chuan Liu

    Rice University

  • Rong Yu

    Renming University of China, Physics Department, Renmin University, Renmin University of China, Department of Physics, Renmin University of China

  • 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