Magnetic Ordering, Orbital State and Lattice Distortion in Perovskite Manganites

Journal of the Physical Society of Japan

Volumn 66, Issue 10, 1997, Pages 3159-3170

  Shiina, Ryousuke ^a   Nishitani, Tomohiro ^a   Shiba, Hiroyuki ^a  

^a TOKYO INSTITUTE OF TECHNOLOGY   (Japan)

Author keywords

Magnetic ordering; Orbital state; Transition metal oxide

Indexed keywords

EID: 0031313740     PISSN: 00319015     EISSN: None     Source Type: Journal    
DOI: 10.1143/JPSJ.66.3159     Document Type: Article

References (26)

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22. In general several higher-rank tensorial moments in addition to the vectorial moments can be defined in the S = 2 spin space, different from S = 1/2 spin space. However, they do not appear in the interaction Hamiltonian derived by the lowest-order perturbation expansion in terms of the hopping integrals. This is because only one electron with S = 1/2 spin can be exchanged in each perturbation process. Thus the essential moments for the interaction Hamiltonian of manganites are only vectorial spin moments.
23. The fluctuation around the mean-field solution is expected to lift this kind of degeneracy, which is not required by the cubic symmetry.
24. Ishihara et al. suggested that the A-type structure is stable only in a small region when δ is finite.
25. It is suggested in ref. 17 that the change in the transfer integrals due to the lattice distortion, which is not considered if this work, is slightly favorable to the A-type phase.
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