NMR Study on the Supertransferred Hyperfine Magnetic Field at ^55Mn in Ferromagnetic Perovskites La (Co_<1-x>Mg_x)_<0.5>Mn_<0.5>O_3
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概要
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Magnetic properties and the hyperfine magnetic fields at ^55Mn in ferromagnetic oxides La(Co^<2+>_<1-x>Mg^<2+>_x)_<0.5>Mn^<4+>_<0.5>O_3(0≤x≤0.4) are studied. The exchange integral, J, for the superexchange interaction between neighboring Mn^<4+> and Co^<2+>ions is found to be + 15.3 K in magnitude. ^55Mn NMR spectra, composed of several equidistantly separated peaks, are interpreted as each peak being the signal associated with Mn^<4+> surrounded by a specific number of Co^<2+> ions. The supertransferred hyperfine magnetic field, H_<STHF>, at ^55Mn from each neighboring Co^<2+> ion is found to be +5.0 kOe, which is considerably smaller than that (+6.3 kOe) from Ni^<2+> in a similar oxide system La(Ni_<1-x>Mg_x)_<0.5>Mn_<0.5>O_3. On the other hand, the hyperfine magnetic field (-296 kOe) originating from 3d magnetic moment of Mn^<4+> is virtually the same in both systems. The values of J and H_<STHF> are discussed in relation with the spin density in 2p_σ orbitals of the oxygen ions.
- 社団法人日本物理学会の論文
- 1995-04-15
著者
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ASAI Kichizo
Department of Applied Physics and Chemistry, The University of Electro-Communications
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Asai K
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Asai Kichizo
Department Of Applied Physics And Chemistry The University Of Electro-communications
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NISHIMORI Nobuhiko
Department of Applied Physics and Chemistry,The University of Electro-Communications
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Mizoguchi Moriji
Department of General Education, Tokyo Medical and Dental University
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Nishimori Nobuhiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Mizoguchi Moriji
College Of Liberal Arts And Science Tokyo Medical And Dental University
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Mizoguchi M
Tokyo Medical And Dental Univ. Chiba
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