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Phys Rev Lett. 2007 Jan 12;98(2):026402. Epub 2007 Jan 12.

Kondo breakdown and hybridization fluctuations in the kondo-heisenberg lattice.

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1
SPhT, CEA-Saclay, L'Orme des Merisiers, 91191 Gif-sur-Yvette, France.

Abstract

We study the deconfined quantum critical point of the Kondo-Heisenberg lattice in three dimensions using a fermionic representation for the localized spins. The mean-field phase diagram exhibits a zero temperature quantum critical point separating a spin liquid phase where the hybridization vanishes and a Kondo phase where it does not. Two solutions can be stabilized in the Kondo phase: namely, a uniform hybridization when the band masses of the conduction electrons and the spinons have the same sign, and a modulated one when they have opposite sign. For the uniform case, we show that above a very small temperature scale, the critical fluctuations associated with the vanishing hybridization have dynamical exponent z=3, giving rise to a resistivity that has a TlogT behavior. We also find that the specific heat coefficient diverges logarithmically in temperature, as observed in a number of heavy fermion metals.

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