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

TitleCritical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model
Publication TypeJournal Article
Year of Publication2020
AuthorsA. Cai, J.. H. Pixley, K. Ingersent, and Q. Si
JournalPhys. Rev. B
Volume101
Pagination014452
Date PublishedJAN 31
Type of ArticleArticle
ISSN2469-9950
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.

DOI10.1103/PhysRevB.101.014452