Interplay of charge and spin fluctuations in a Hund's coupled impurity

Victor Drouin-Touchette, Elio J. König, Yashar Komijani, Piers Coleman

Research output: Contribution to journalArticlepeer-review


In Hund's metals, the local ferromagnetic interaction between orbitals leads to an emergence of complex electronic states with large and slowly fluctuating magnetic moments. Introducing the Hund's coupled mixed-valence quantum impurity, we gain analytic insight into recent numerical renormalization group studies. We show that valence fluctuations drastically impede the development of a large fluctuating moment over a wide range of temperatures and energy, characterized by quenched orbital degrees of freedom and a singular logarithmic behavior of the spin susceptibility χsp″(ω) [ωln(ω/TKeff)2]-1, closely resembling power-law scaling χsp″(ω)∼ω-γ. Finally, we outline how such singular spin fluctuations can play an important role in generating a superconducting state through Hund's driven Cooper pairing.

Original languageAmerican English
Article numberL042011
JournalPhysical Review Research
Issue number4
StatePublished - Oct 2022

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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