Conduction Electron Polarization in Mixed Scandium Laves Phases with Cobalt and Nickel
Conduction Electron Polarization in Mixed Scandium Laves Phases with Cobalt and Nickel
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DOI：
10.1063/1.1708418
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发表时间：
1966-03
影响因子：
3.2
通讯作者：
R. Barnes;B. Beaudry;R. G. Lecander
中科院分区：
文献类型：
--
作者：
R. Barnes;B. Beaudry;R. G. Lecander
本文研究了立方Laves相金属间化合物Sc(CoxNi1δx)2(其中0−x≤1)在30 0°K下的奈特移K和线宽≤H，与ScNi2可能的简单泡利顺磁性相符，K=+0.39%，而在ScCo2中，K=−0.43%，表明Co°(D9)离子对K有d自旋贡献.在ScCo_2中，δH可解释为Co离子交换窄的偶极场的结果，J/k=0.44°K。在混合化合物中，δH随外加磁场H和x的上下变化而线性变化，并且平均K在ScNi_2和ScCO_2值之间变化平稳，但不是线性变化。δH的场和成分的依赖关系可以用由Co邻居的随机分布引起的K值的分布来解释。体积磁化率的初步测量表明，奈特位移和磁化率可能是直接相关的。
The Knight shift K and linewidth δH of the 45Sc NMR in the cubic Laves phase intermetallic system Sc(CoxNi1−x)2, where 0≤x≤1, have been investigated at 300°K. In accord with the probable simple Pauli paramagnetism of ScNi2, K=+0.39%, whereas in ScCo2, K=−0.43%, indicative of a d‐spin contribution to K from the Co° (d9) ions. In ScCo2, δH may be interpreted as resulting from the exchange‐narrowed dipolar field of the Co ions, with J/k=0.44°K. In the mixed compounds, δH varies linearly both with applied field H and composition x above and below x=0.5, and the average K varies smoothly, but not linearly, between the ScNi2 and ScCo2 values. The field and composition dependence of δH may be interpreted in terms of a distribution of K values resulting from the random distribution of Co neighbors. Preliminary measurements of the volume susceptibility indicate that the Knight shift and susceptibility may be directly correlated.