Crossover to non-Fermi-liquid spin dynamics in cuprates

Details Crossover to non-Fermi-liquid spin dynamics in cuprates Crossover to non-Fermi-liquid spin dynamics in cuprates

2004-03-05

arxiv.org/abs/cond-mat/0403165v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. Submitted to PRL

Scientific paper

10.1103/PhysRevB.70.224505

The antiferromagnetic spin correlation function $S_{\bf Q}$, the staggered spin susceptibility $\chi_{\bf Q}$ and the energy scale $\omega_{FL}=S_{\bf Q}/\chi_{\bf Q}$ are studied numerically within the t-J model and the Hubbard model, as relevant to cuprates. It is shown that $\omega_{FL}$, related to the onset of the non-Fermi-liquid spin response at $T>\omega_{FL}$, is very low in the regime below the 'optimum' hole doping $c_h < c_h^* \sim 0.16$, while it shows a steep increase in the overdoped regime. A quantitative analysis of NMR spin-spin relaxation-rate $1/T_{2G}$ 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.

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