Crossover to non-Fermi-liquid spin dynamics in cuprates
arXiv:cond-mat/0403165 · doi:10.1103/PhysRevB.70.224505
Abstract
The antiferromagnetic spin correlation function , the staggered spin susceptibility and the energy scale are studied numerically within the t-J model and the Hubbard model, as relevant to cuprates. It is shown that , related to the onset of the non-Fermi-liquid spin response at , is very low in the regime below the 'optimum' hole doping , while it shows a steep increase in the overdoped regime. A quantitative analysis of NMR spin-spin relaxation-rate for various cuprates reveals a similar behavior, indicating on a sharp, but continuous, crossover between a Fermi-liquid and a non-Fermi-liquid behavior as a function of doping.
4 pages, 4 figures. Submitted to PRL
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