Existence of Saturated Ferromagnetic and Spiral States in 1D Lied-Ferrimagnetic Models away from Half-Filling
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概要
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In order to sttrdy conditions ['or the appear;tnce of f'errotta?tgnetisna in a xx'ide filling region, xveinvestigaate nv.rmer'ically three tyjces of' one-ditaaetasiona[ Lielo-ferritnagnetic Httbl*ard rauodels: aperiodic disrnmond (PD) ch;tin, 21 periodic stltertaatteJy-attaclaed leg (PAAL) cJustin atnd 2111 opendiauanond (CD) cJuatin. All of' these rnodeJ,'; hztx'e sr fJ?tt lcand (or eqtuivalently, degenersrte singleeJectrort eigeruxzstltzes). The PD ?auad CD ch?tirus COl11Il1OI11.N7 laaxre a loc;tl-loop strtrcttrre. Nag?roka'stheorettt laolds otuly in time PD claain. At half'-filling, it have been r'igorously jcroven that 2111 o['thesertaodels are ['erritaaagnet. AXV2lV f'rorta la;tlf'-filling, hoxvexzer, qtrite difl'erent taaagnetic properties aref'otrnd. In the fittings 1/3< p.< 172, tlae grotrnd ststte of the PD chstin far 21 infinitely-[ar'geU is the extended f'errouta?tgnetic st;tie, tla?tt is, the satv.rrated f'errouaaagnetic ststte or the spiralstate f'or odd or even IILIIIII)Cl' of' electrons, respectively. In the PAAL chain, on tlne other hand.there is no ttaagnetic order. Thtrs, the fJztt bstnd is ['otznd to be not a stuflicieuut condition of theextended f'erroztt?rgnetic stztte. NX'e fitad, ua?oreover, thstt the saxttrrated I'errornagnetistta ajcpears intJae CD cJaain, ?rlthotrgh tire N21:2101(21 theor'euaa does not hold 011 this chain. This itadic?rtes th;ttthe local-loojc structtrre pl?te's 2111 ittajcort?tnt role on tlae ;tjcjcestrance of' the extended ferrontaagtaeticstatte.
- 社団法人日本物理学会の論文
- 1999-09-15
著者
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Watanabe Yuuki
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
-
Miyashita Seiji
Department Of Applied Physics University Of Tokyo
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Miyashita Seiji
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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