Nuclear Magnetic Resonance of Paramagnetic CO_3O_4. : I. Experimental Study
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概要
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Nuclear magnetic resonance of Co^<59> in polycrystalline Co_3O_4 and ZnCo_2O_4, and Al^<27> in CoAl_2O_4 in paramagnetic state was observed. The cobalt signal was identified with the Co^<3-> ions at the octahedral sites of the spinel structure. The line shift of Co^<59> in Co_3O_4 was separated into two terms: temperature-independent and temperature-dependent ones. The temperature-independent shift (1.5%) is interpreted as the second order chemical shift due to the mixing of the low lying excited state. The temperature-dependent shift is attributed to the hyperfine coupling between the cobalt nuclear spin and the electron spins on the Co^<2+> ions at the tetrahedral sites. The isotropic hyperfine coupling constant A is estimated at 13×10^<-4>cm^<-1>. The results on ZnCo_2O_4 and CoAl_2O_4 give supports to the above interpretations. The line shapes were studied and the thermal relaxation time T_1 was estimated to be 1.5×10^<-5>sec.
- 社団法人日本物理学会の論文
- 1966-03-05
著者
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KOHN Kay
Department of Physics, Waseda University
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Kohn Kay
Department Of Applied Physics School Of Science And Engineering Waseda University
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Kohn Kay
Department Of Physics Faculty Of Science University Of Tokyo
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IIDA Shuichi
Department of Physics, Faculty of Science, The University of Tokyo
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KAMIMURA Hiroshi
Department of Physics,Faculty of Science,University of Tokyo
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Iida Shuichi
Department Of Physics Faculty Of Science The University Of Tokyo
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Miyatani Kazuo
Tokyo Metropolitan University
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Kamimura Hiroshi
Department Of Electronic Engineering Gunma University
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Kamimura Hiroshi
Department Of Applied Physics . Faculty Of Science Tokyo University Of Science
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Iida Shuichi
Department Of Physics Faculity Of Science University Of Tokyo
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Miyatani K.
Tokyo Metropolitan University
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Iida Shuichi
Department of Applied Physics, Tokyo Institute of Technology
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