Kondo destruction and valence fluctuations in an Anderson model

Details Kondo destruction and valence fluctuations in an Anderson model Kondo destruction and valence fluctuations in an Anderson model

2011-08-26

arxiv.org/abs/1108.5227v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

Unconventional quantum criticality in heavy-fermion systems has been extensively analyzed in terms of critical destruction of the Kondo quenching of localized spins. Motivated by a recent demonstration of quantum criticality in a mixed-valent heavy-fermion system, we study a particle-hole-asymmetric Anderson impurity model with a pseudogapped density of states. We demonstrate Kondo destruction at a mixed-valent quantum critical point, where a collapsing Kondo energy scale is accompanied by a singular charge fluctuation spectrum. Both spin and charge responses scale with energy over temperature (\omega/T) and magnetic field over temperature (H/T). Implications for unconventional quantum criticality in mixed-valence heavy fermions are discussed.

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