Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.086403
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Funding
- NSF Grants [DMR-0710540, DMR-1006985, DMR-1107814]
- Robert A. Welch Foundation Grant [C-1411]
- NSF
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1108285] Funding Source: National Science Foundation
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Unconventional quantum criticality in heavy-fermion systems has been extensively analyzed in terms of a critical destruction of the Kondo effect. Motivated by a recent demonstration of quantum criticality in a mixed-valent heavy-fermion system, beta-YbAlB4, 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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