Nuclear Magnetic Relaxation in Magnetite
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概要
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The nuclear magnetic relaxation times in Fe<SUB>3</SUB>O<SUB>4</SUB> have been measured. The experimental values of <I>T</I><SUB>1</SUB> and <I>T</I><SUB>2</SUB> range from 1.4 sec to 0.4 ms between 4.2° and 300°K. For the <I>A</I> ion, <I>T</I><SUB>1</SUB> and <I>T</I><SUB>2</SUB> are roughly equal, increasing with a magnetic field, above 120°K and show the minima at about 80° and 40°K, respectively, independent of the field. For the <I>B</I> ion, <I>T</I><SUB>1</SUB> and <I>T</I><SUB>2</SUB> are independent of the field with <I>T</I><SUB>1</SUB>⁄<I>T</I><SUB>2</SUB>≈2 from 130°K to 300°K. The results are explained semi-quantitatively by the effect of the electron migration in the <I>B</I> sites. Detailed calculations show: (1) <I>T</I><SUB>1</SUB> and <I>T</I><SUB>2</SUB> for the <I>A</I> ion are governed by the coupling of the nucleus with the migrating electrons through the dipolar interaction below 120°K and through the hyperfine and the <I>A</I>-<I>B</I> exchange interactions above 120°K; (2) the anisotropic and the isotropic hyperfine interactions give the essential contributions to <I>T</I><SUB>1</SUB> and <I>T</I><SUB>2</SUB> for the <I>B</I> ion, respectively.
- 社団法人 日本物理学会の論文
社団法人 日本物理学会 | 論文
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