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Non-Fermi-liquid fixed point in multi-orbital Kondo impurity model relevant for Hund's metals

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arxiv 1907.07100 v2 pith:CHBTTMGY submitted 2019-07-16 cond-mat.str-el

Alen Horvat , Rok Zitko , Jernej Mravlje This is my paper · ORCID
classification cond-mat.str-el
keywords orbitalhundimpuritymetalsmodelstatedependencefixed
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Due to the separation between the spin and the orbital screening scales, the normal state of Hund's metals at ambient temperature can be loosely characterized as a partially coherent state with fluctuating spins and quenched orbital moments. With the aim to characterize this situation more precisely, we investigate the Kondo-Kanamori impurity model that describes the low-energy local physics of three-orbital Hund's metals occupied by two or four electrons. Within this model one can diminish the mixed spin-orbital terms and thereby enhance the separation between the two screening scales, allowing a more precise investigation of the intermediate state. Using the numerical renormalization group we calculate the impurity entropy as well as the temperature and frequency dependence of the spin and the orbital susceptibilities. We uncover a non-Fermi-liquid two-channel overscreened SU(3) fixed point that controls the behavior in the intermediate regime. We discuss its fingerprints in the frequency dependence of local orbital susceptibility and the shape of the spectral function.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Uncovering Non-Fermi-Liquid Behavior in Hund Metals: Conformal Field Theory Analysis of an SU(2)$\times$SU(3) Spin-Orbital Kondo Model

    cond-mat.str-el 2019-08 accept novelty 8.0 of 10

    A conformal-field-theory solution of the SU(2)xSU(3) spin-orbital Kondo model yields spin susceptibility exponents -11/5 in the NFL regime and -6/5 in the spin-splitting regime, matching NRG and explaining prior DMFT results.

  2. Nonlocal Coulomb interaction and spin-freezing crossover as a route to valence-skipping charge order

    cond-mat.str-el 2019-08 conditional novelty 7.0 of 10

    Intersite Coulomb repulsion V drives d3+d1 valence-skipping charge order in a three-orbital Hund's metal, and the critical V is lowered inside the spin-freezing crossover regime.

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