Anomalous magnetization process in frustrated spin ladders
Tôru Sakai, Kiyomi Okamoto, Kouichi Okunishi, Masahiro Sato
Abstract
We study, at T=0, the anomalies in the magnetization curve of the S=1 two-leg ladder with frustrated interactions. We focus mainly on the existence of the M=/2 plateau, where is the saturation magnetization. We use analytical methods (degenerate perturbation theory and non-Abelian bosonization) as well as numerical methods (level spectroscopy and density matrix renormalization group), which lead to the consistent conclusion with each other. We also touch on the M=/4 and M=(3/4) plateaux and cusps.
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