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.
Non-Fermi-liquid fixed point in multi-orbital Kondo impurity model relevant for Hund's metals
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abstract
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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cond-mat.str-el 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Nonlocal Coulomb interaction and spin-freezing crossover as a route to valence-skipping charge order
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.