Nuclear relaxation in the spin-1/2 antiferromagnetic chain compound Sr_2CuO_3 --- comparison between theories and experiments

Abstract

The NMR relaxation data on Sr_2CuO_3 [Phys. Rev. Lett. 76, 4612 (1996)] are reexamined and compared with the analytic theory of the dynamic susceptibility in the S=1/2 antiferromagnetic Heisenberg chain including multiplicative logarithmic corrections [Phys. Rev. Lett. 78, 539 (1997); cond-mat/9610015]. Comparisons of the spin-lattice and the gaussian spin-echo decay rates (1/T_1 and 1/T_{2G}) and their ratio all show good quantitative agreement. Our results demonstrate the importance of the logarithmic corrections in the analysis of experimental data for quasi-1D systems and indicate that the dynamics of Sr_2CuO_3 is well described by a S=1/2 one-dimensional Heisenberg model with a nearest neighbor exchange.

8 pages, RevTex, 3 postscript figures

References in corpus (1)

• Dynamics of the spin-half Heisenberg chain at intermediate temperatures

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