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Mardi 07/11/2006 - 14H00

Quantum Criticality Near Kondo Breakdown Fixed Point

Indranil Paul (Argonne National Laboratory)

par Webmaster - 7 novembre 2006

After a brief introduction to the topic of magnetic quantum criticality in metallic systems, I will present a study of the Kondo-Heisenberg model in three dimensions. The mean field phase diagram exhibits a spin liquid phase and a heavy-fermion phase, separated by a quantum critical point where an energy scale associated with Kondo hybridization vanishes. The quantum critical regime of this system has a small, but finite, temperature scale. Above this scale the critical fluctuations associated with the vanishing Kondo hybridization has a dynamical exponent z=3, giving rise to a resistivity which has T\log T temperature dependence. The transport and thermodynamic properties near this quantum critical point will be discussed in light of recent experiments on heavy fermion systems.