Magnetization Measurement and 55Mn NMR Study of La(Ni1-xMgx)0.5Mn0.5O3
Magnetization Measurement and 55Mn NMR Study of La(Ni1-xMgx)0.5Mn0.5O3
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La(Ni1-xMgx)0.5Mn0.5O3的磁化强度测量及55Mn NMR研究
DOI：
10.1143/jpsj.61.4193
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发表时间：
1992
影响因子：
1.7
通讯作者：
K. Asai
中科院分区：
文献类型：
--
作者：
M. Sonobe;K. Asai
对铁磁体系La（Ni 2+ 1- x Mg x2+）0.5Mn0.54 + O3进行了磁化强度测量和55 MnNMR研究。结果表明，在整个组成范围内，二价和四价离子在很大程度上是有序的，相邻Mn 4+和Ni 2+离子之间的铁磁超交换作用的大小为26 K.对于x ≤0.6的样品，在270和310 MHz之间的频率范围内观察到55 Mn NMR信号。由多个等距离分离的峰组成的光谱可以成功地解释为每个峰都是由特定数量的Ni 2+离子包围的Mn 4+的信号。在55 Mn处，由相邻的Ni 2+离子超转移的超精细磁场为6.3kOe，由Mn 4+离子自身的3d磁矩产生的超精细磁场为-295 kOe，这是Mn 4+离子在氧化物中的典型值。
Magnetization measurement and 55 Mn NMR study on a ferromagnet system La(Ni 2+ 1- x Mg x 2+ ) 0.5 Mn 0.5 4+ O 3 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 Mn 4+ and Ni 2+ ions are estimated to be 26 K in magnitude. 55 Mn NMR signals are observed for samples with x ≤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 4+ surrounded by a specific number of Ni 2+ ions. The hyperfine magnetic field at 55 Mn supertransferred from a neighboring Ni 2+ ion is determined to be 6.3 kOe, and the field originating from the own 3d magnetic moment of Mn 4+ ion is estimated to be -295 kOe, being a typical value for Mn 4+ ions in oxides.