arXiv:cond-mat/9907481 · Physica B Condensed MatterQuantum phase transition of trimerized XXZ spin chain in magnetic fieldKiyomi Okamoto, Atsuhiro KitazawaPublished Jun 1, 2000• 2 citationsarXivHTMLPDFDOI10.1016/s0921-4526(99)01062-5