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

3 Scopus citations

Abstract

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 languageEnglish (US)
Article numberL042011
JournalPhysical Review Research
Volume4
Issue number4
DOIs
StatePublished - Oct 2022

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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