Effects of Electron Correlation,Orbital Degeneracy and Jahn-Teller Coupling in Perovskite Manganites
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概要
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Roles of Coulozmb interaction, orbital degeneracy and Jahn-Teller coupling in double-exchangenaodels are ex?trnined for perovskite Nln oxides. We sttrdy the undoped insulator 21,S well as unetal-instrlator transitions by hole doping, and esjoecially strong incoherence of' ferrotnagnetic metal.We derive models where atll the spins are f'tully polarized in two-ditmensional planes as indicated byexperimental results, and investigate their ground-state properties by the quantum Monte Carlounethod. At halt' filling where the nvruaaber of' e. electrons is one per site on average, the Coulombinteraction opens a Ivlott gap and indtrces a staggered orbital ordering. The opening of the gapis, however, strbstantially sloxver than the mean-field restrlts if tlae Jahn-Teller coupling is absent.The synergy between the strong correlation and the Jahn-Teller coupling largely enhances thecharge gap arnplittrde and reprodtrces realistic arnplittrdes and stabilization energy of the JahnTeller distortion. Doping of carriers destroys the orbital ordering stabilized by the Coulombinteraction. The short-ranged orbital correlation is critically enhanced in tnetals toward thernetal-inastrlator transition, which should be related to the strong incoherence of charge dynarauicsobserved in experiments. Ottr model, naoreover, exhibits a trnifortn ordering of' d.c .2 orbitalsover a wide region of doping in agreement with experinuental indications.
- 社団法人日本物理学会の論文
- 1999-01-15
著者
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Imada Masatoshi
Institute For Solid State Physics University Of Tokyo
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Motome Yukitoshi
Department Of Applied Physics University Of Tokyo
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Motome Yukitoshi
Department Of Physics Tokyo Institute Of Technology
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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