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

TL;DR

This paper reexamines NMR relaxation data of Sr_2CuO_3, demonstrating that including logarithmic corrections in the S=1/2 Heisenberg chain model accurately describes experimental results, emphasizing the model's validity for quasi-1D systems.

Contribution

It provides a detailed comparison between experimental NMR data and an analytic theory incorporating logarithmic corrections, confirming the Heisenberg model's applicability to Sr_2CuO_3.

Findings

Good quantitative agreement between theory and experiment

Logarithmic corrections are crucial for data analysis

Sr_2CuO_3 dynamics are well described by the S=1/2 Heisenberg model

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.