Locally critical point in an anisotropic Kondo lattice

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  • 22 July 2002
Abstract
We report the first numerical identification of a locally quantum critical point, at which the criticality of the local Kondo physics is embedded in that associated with the magnetic ordering. The solution is fully consistent with the earlier analytical results based on a renormalization group ($\epsilon$ expansion) method. We also show that our Quantum Monte Carlo results, carried out for an anisotropic Kondo-lattice model, are consistent with those of a large-N saddle-point analysis. Finally, our calculated critical exponent for the ${\bf q}-$dependent dynamical spin susceptibility is fractional and compares well with the experimental value for heavy fermion metals.

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