NMR Study of Internal Field of Trivalent Diamagnetic Cations in Nickel Ferrite
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概要
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Large internal fields of Al^<3+>, Ga^<3+> substituted in NiFe_2O_4 were observed with spin echo method at 4.2K. The fields increase rapidly with the atomic number. Contributions to the field by the A-A and B-B interactions are negligibly small in comparison with the A-B interaction. Transferred fields of these cations from Fe^<3+> and Ni^<2+> were separated. Direction of the field of In^<3+> on the A-site is parallel to the total magnetization. The results were analyzed with a simple molecular orbital method. Polarized valence orbital of the diamagnetic cations induces the field predominantly but distorted outermost closed shell also contributes considerably to the field through cross terms. Electron transfers from one 2p and 2s orbitals of O^<2-> to the cations on the A-site are 4∼6% and 0.1∼0.5% respectively and those from one 2p orbital of O^<2-> to the cations on the B-site are 10∼13%.
- 社団法人日本物理学会の論文
- 1974-11-15
著者
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Iida Shuichi
Department Of Physics Faculty Of Science The University Of Tokyo
-
Miyahara Yoshikazu
Department Of Physics Faculty Of Science University Of Tokyo:(present Address) National Laboratory F
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Miyahara Yoshikazu
Department Of Physics Faculty Of Science University Of Tokyo:(present Address) National Laboratory F
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Iida Shuichi
Department Of Physics Faculity Of Science University Of Tokyo
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