Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model
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 new insights into the mechanism for superconductivity in quantum critical metals.
Keywords
Cite
@article{arxiv.1604.06449,
title = {Critical local moment fluctuations and enhanced pairing correlations in a cluster Anderson model},
author = {Ang Cai and J. H. Pixley and Kevin Ingersent and Qimiao Si},
journal= {arXiv preprint arXiv:1604.06449},
year = {2020}
}
Comments
9 pages, 11 figures, published version