@article{oai:sucra.repo.nii.ac.jp:00012526,
 author = {飛田, 和男},
 issue = {6},
 journal = {Journal of the Physical Society of Japan},
 month = {},
 note = {http://jpsj.ipap.jp/link?JPSJ/74/1849 | http://jpsj.ipap.jp/link?JPSJ/74/1849, The competition between quantum and classical magnetization plateaus of S = 1/2 frustrated　Heisenberg chains with modified exchange couplings is investigated. The conventional　S = 1/2 frustrated Heisenberg chain is known to exhibit a 3-fold degenerate ↑↓↑ -type classical　plateau at 1/3 of the saturation magnetization accompanied by the spontaneous Z3 translational　symmetry breakdown. The stability of this plateau phase against period 3 exchange　modulation which favors the ?-? ↑-type quantum plateau state (?-? = singlet dimer) is studied　by bosonization, renormalization group and numerical diagonalization methods. The ground　state phase diagram and the spin configuration in each phase are numerically determined. The　translationally invariant Valence Bond Solid-type model with 4-spin and third neighbor interactions,　which has the exact ?-? ↑-type quantum plateau state, is also presented. The phase　transition to the classical ↑↓↑ -type ground state is also observed by varying the strength of　4-spin and third neighbor interactions. The relation between these two types of models with　quantum plateau states is discussed., Copyright(c)2005 The Physical Society of Japan, text, application/pdf},
 pages = {1849--1857},
 title = {Quantum vs classical magnetization plateaus of S=1/2 frustrated Heisenberg chains},
 volume = {74},
 year = {2005},
 yomi = {ヒダ, カズオ}
}