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- W3104527645 abstract "Properties and mechanism of the magnetic phase transition of the perovskite-type Ti oxides, which is driven by the Ti-O-Ti bond angle distortion, are studied theoretically by using the effective spin and pseudo-spin Hamiltonian with strong Coulomb repulsion. It is shown that the A-type antiferromagnetic(AFM(A)) to ferromagnetic(FM) phase transition occurs as the Ti-O-Ti bond angle is decreased. Through this phase transition, the orbital state is hardly changed so that the spin-exchange coupling along the c-axis changes nearly continuously from positive to negative and takes approximately zero at the phase boundary. The resultant strong two-dimensionality in the spin coupling causes a rapid suppression of the critical temperature as is observed experimentally." @default.
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- W3104527645 date "2000-07-15" @default.
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- W3104527645 title "Magnetic Phase Transition of the Perovskite-Type Ti Oxides" @default.
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- W3104527645 doi "https://doi.org/10.1143/jpsj.69.1982" @default.
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