A-Type Antiferrospin Ordering under the Antiferroorbital Order in Perovskite-Type Compounds (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• The appearance of the A-type antiferrospin (A-AFS) order under the antiferroorbital (AFO) order observed in some perovskite-like compounds is studied theoretically to resolve discrepancies between existing theories and to clarify its mechanism in an open way. The various kinetic exchange interactions (KEI) between degenerate dγ orbitals of neighboring magnetic ions are derived not to violate the crystal symmetry with making no assumption on the transfer integrals. The KEI constants which are affected by the Hund coupling under the AFO order due to the joint effect of the cooperative Jahn-Teller effect (CJTE) and the orbital exchange interaction can explain successfully the appearance of the A-AFS ordering. The close relation between the AFO and A-AFS orders, the role of the CJTE, and the effect of the presence of the unfilled d∈ orbitals are clarified. The obtained results are consistent with the properties of the A-AFS order observed in LaMnO_3, MnF_3 and KCuF_3.

• 社団法人日本物理学会の論文
• 2004-05-15

著者

• Kataoka Mitsuo

  Department Of Physics Faculty Of Science Osaka University:(present Address) The Research Institute F

• Kataoka Mitsuo

  Department Of Material Research Graduate School Of Iwaki Meisei University

• KATAOKA Mitsuo

  Department of Material Research, Graduate School of Iwaki Meisei University

関連論文

• A-Type Antiferrospin Ordering under the Antiferroorbital Order in Perovskite-Type Compounds (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
• Origin of the Antiferroorbital Ordering in LaMnO_3 and Other Related Compounds (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
• A Theory of the Cooperative Jahn-Teller Effect : Crystal Distortions in Cu_Ni_xCr_2O_4 and Fe_Ni_xCr_2O_4
• Theory of the Antiferroorbital Ordering Due to the Cooperative Jahn–Teller Effect

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