MAGNETIZATION MEASUREMENT AND MN-55 NMR-STUDY OF LA(NI1-XMGX)0.5MN0.5O3

被引:76
作者
SONOBE, M
ASAI, K
机构
[1] Department of Applied Physics and Chemistry, University of Electro-Communications, Chofu-shi, Tokyo 182
关键词
SUPERTRANSFERRED HYPERFINE MAGNETIC FIELD; MN-55; NMR; FERROMAGNETIC OXIDE; IONIC ORDER IN PEROVSKITE;
D O I
10.1143/JPSJ.61.4193
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Magnetization measurement and Mn-55 NMR study on a ferromagnet system La(Ni1+x2+Mgx2+)0.5Mn0.54+O3 are made. The divalent and the tetravalent ions are found to be ordered to a considerable extent in the whole compositional range, and the ferromagnetic superexchange interactions between neighboring Mn4+ and Ni2+ ions are estimated to be 26 K in magnitude. Mn-55 NMR signals are observed for samples with x less-than-or-equal-to 0.6 in a frequency range between 270 and 310 MHz. The spectra composed of several equidistantly separated peaks can be successfully interpreted as each peak being the signal from Mn" surrounded by a specific number of Ni2+ ions. The hyperfine magnetic field at Mn-55 supertransferred from a neighboring Ni2+ ion is determined to be 6.3 kOe, and the field originating from the own 3d magnetic moment of Mn4+ ion is estimated to be - 295 kOe, being a typical value for Mn4+ ions in oxides.
引用
收藏
页码:4193 / 4203
页数:11
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