{"paper":{"title":"Finite-Field Ground State of the S=1 Antiferromagnetic-Ferromagnetic Bond-Alternating Chain","license":"","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.stat-mech","authors_text":"Kiyomi Okamoto, Makoto Kaburagi, Takashi Tonegawa","submitted_at":"2004-12-09T14:03:07Z","abstract_excerpt":"We investigate the finite-field ground state of the S=1 antiferromagnetic-ferromagnetic bond-alternating chain described by the Hamiltonian ${\\calH}=\\sum\\nolimits_{\\ell}\\bigl\\{\\vecS_{2\\ell-1}\\cdot\\vecS_{2\\ell} +J\\vecS_{2\\ell}\\cdot\\vecS_{2\\ell+1}\\bigr\\} +D\\sum\\nolimits_{\\ell} \\bigl(S_{\\ell}^z)^2 -H\\textstyle\\sum\\nolimits_\\ell S_\\ell^z$, where \\hbox{$J\\leq0$} and \\hbox{$-\\infty<D<\\infty$}. We find that two kinds of magnetization plateaux at a half of the saturation magnetization, the 1/2-plateaux, appear in the ground-state magnetization curve; one of them is of the Haldane type and the other is"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0412234","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}