Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach

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dc.creatorMochizuki, Masahito
dc.creatorImada, Masatoshi
dc.date2001-02-13
dc.date.accessioned2026-07-07T06:21:57Z
dc.date.available2026-07-07T06:21:57Z
dc.descriptionThe 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 pseudospin 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 changes only little whereas the spin-exchange coupling along the c-axis is expected to change from positive to negative nearly continuously and approaches zero at the phase boundary. The resultant strong two-dimensionality in the spin coupling causes rapid suppression of the critical temperature, as observed experimentally. It may induce large quantum fluctuations in this region.
dc.description13 pages, 15 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0102223
dc.identifierhttp://arxiv.org/abs/cond-mat/0102223
dc.identifierJ. Phys. Soc. Jpn. 70 (2001) 1777
dc.identifierdoi:10.1143/JPSJ.70.1777
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95770
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleMagnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach
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