Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-02-13
J. Phys. Soc. Jpn. 70 (2001) 1777
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 15 figures
Scientific paper
10.1143/JPSJ.70.1777
The 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.
Imada Masatoshi
Mochizuki Masahito
No associations
LandOfFree
Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-146036