Pixley, J.H.Kirchner, StefanIngersent, KevinSi, Qimiao2013-03-142013-03-142012Pixley, J.H., Kirchner, Stefan, Ingersent, Kevin, et al.. "Kondo Destruction and Valence Fluctuations in an Anderson Model." <i>Physical Review Letters,</i> 109, (2012) American Physical Society: 86403. http://dx.doi.org/10.1103/PhysRevLett.109.086403.https://hdl.handle.net/1911/70612Unconventional 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, -YbAlB4, we study a particle-hole-asymmetric Anderson impurity model with a pseudogapped density of states. We demonstrate Kondo destruction at a mixedvalent 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 (!=T) and magnetic field over temperature (H=T). Implications for unconventional quantum criticality in mixedvalence heavy fermions are discussed.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.109.086403