Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model

Ang Cai, J. H. Pixley, Kevin Ingersent, Qimiao Si

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The appearance of unconventional superconductivity near heavy-fermion quantum critical points (QCPs) motivates investigation of pairing correlations close to a "beyond Landau" Kondo-destruction QCP. We focus on a two-Anderson-impurity cluster in which Kondo destruction is induced by a pseudogap in the conduction-electron density of states. Analysis via continuous-time quantum Monte Carlo and the numerical renormalization group reveals a previously unstudied QCP that both displays the critical-local moment fluctuations characteristic of Kondo destruction and leads to a strongly enhanced singlet-pairing susceptibility. Our results provide insights into the mechanism for superconductivity in quantum critical metals.

Original languageEnglish (US)
Article number014452
JournalPhysical Review B
Volume101
Issue number1
DOIs
StatePublished - Jan 31 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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