Magnetization Process in Two-Dimensional Coupled Plaquette System on the 1/5-Depleted Square Lattice
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概要
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IV1agnetization process in the S : 172 Heisenberg antiferronragnet with plaqttette strvrcttrreand Lip to second neiglabor cotnplings on the 1/5-depleted square lattice is stttdied by trsiragperttrrbation expansiora and exact diagonalizattiota unetlaods. This tnodel describes tlae tauagn'xetismof CaV.j0g f'or an adeqtrate choice of tlae exclaange jcaratneters. Within first order calctrlatior'xs itis shoxvn tlaatt plateatrs at 772 = 1 /8, 1 /4 ?tnd 3 /8 appear for sorne p;tranaeter region of tlae exchangeirateractions, where m denotes magnetization per a spira. The utuagtaetizartiot'r ctnrve for CaV.jOgis calctrlated. which shoxvs tlaat the 1/4-plateatr is clearly observed and CaVjOg is altnost rightat tlae qtrantum critical poizat of tlae 3/8-plateatr. Critical beluavior of flue 1/4-plateatr is alsodiscttssed.
- 1999-11-15
著者
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Fukumoto Yoshiyuki
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Oguchi Akihide
Department Of Physics Faculty Of Sciece And Technology Science University Of Tokyo
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