Locally critical quantum phase transitions in strongly correlated metals

Qimiao Si (), Silvio Rabello, Kevin Ingersent and J. Lleweilun Smith
Additional contact information
Qimiao Si: Rice University
Silvio Rabello: Rice University
Kevin Ingersent: University of Florida
J. Lleweilun Smith: Rice University

Nature, 2001, vol. 413, issue 6858, 804-808

Abstract: Abstract When a metal undergoes a continuous quantum phase transition, non-Fermi-liquid behaviour arises near the critical point. All the low-energy degrees of freedom induced by quantum criticality are usually assumed to be spatially extended, corresponding to long-wavelength fluctuations of the order parameter. But this picture has been contradicted by the results of recent experiments on a prototype system: heavy fermion metals at a zero-temperature magnetic transition. In particular, neutron scattering from CeCu6-x Aux has revealed anomalous dynamics at atomic length scales, leading to much debate as to the fate of the local moments in the quantum-critical regime. Here we report our theoretical finding of a locally critical quantum phase transition in a model of heavy fermions. The dynamics at the critical point are in agreement with experiment. We propose local criticality to be a phenomenon of general relevance to strongly correlated metals.

Date: 2001
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DOI: 10.1038/35101507

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