Magnetic properties for the one-dimensional multicomponent quantum spin system with the excitation gap are studied based on the integrable spin model introduced by Bariev {\it et al}. By exactly computing the magnetization, we show how the characteristic structure with plateaus and cusps appears in the magnetization process. To study low-energy dynamics of the system, we apply the finite-size scaling analysis to the excitation spectrum, and thereby evaluate the power-law exponent as well as the enhancement factor for the low-temperature NMR relaxation rate 1/T1. We discuss the critical properties of 1/T1 around plateaus and cusps in the magnetization curve.
@article{arxiv.cond-mat/0101423,
title = {Magnetic Properties for the One-Dimensional Multicomponent Spin-Gap System},
author = {Akira Kawaguchi and Tatsuya Fujii and Norio Kawakami},
journal= {arXiv preprint arXiv:cond-mat/0101423},
year = {2009}
}