A large-N analysis of the local quantum critical point and the spin-liquid phase
arXiv:cond-mat/0206174 · doi:10.1103/PhysRevB.67.121104
Abstract
We study analytically the Kondo lattice model with an additional nearest-neighbor antiferromagnetic interaction in the framework of large-N theory. We find that there is a local quantum critical point between two phases, a normal Fermi-liquid and a spin-liquid in which the spins are decoupled from the conduction electrons. The local spin susceptibility displays a power-law divergence throughout the spin liquid phase. We check the reliability of the large-N results by solving by quantum Monte Carlo simulation the N=2 spin-liquid problem with no conduction electrons and find qualitative agreement. We show that the spin-liquid phase is unstable at low temperatures, suggestive of a first-order transition to an ordered phase.
4 pages and 1 figure
References in corpus (4)
Cited by in corpus (14)
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