Magnetovolume Effects of Itinerant Electron Ferromagnets. II. Pressure Dependence of Spontaneous Magnetization and Forced- and Spontaneous-Volume Magnetostriction at 0°K
Magnetovolume Effects of Itinerant Electron Ferromagnets. II. Pressure Dependence of Spontaneous Magnetization and Forced- and Spontaneous-Volume Magnetostriction at 0°K
复制标题
流动电子铁磁体的磁体积效应 II。0°K 时自发磁化和强迫和自发体积磁致伸缩的压力依赖性。
DOI：
10.1143/jpsj.27.321
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发表时间：
1969
影响因子：
1.7
通讯作者：
A. Katsuki
中科院分区：
文献类型：
--
作者：
K. Terao;A. Katsuki
公式化了 0°K 下流动电子铁磁体中自发磁化以及强迫和自发体积磁致伸缩的压力依赖性。考虑了带宽和分子场系数对原子体积的依赖性。结果表明，当受迫磁致伸缩量ω H 为负值时，自发体积磁致伸缩量ω s 必定为负值，而当后者为正值时，前者可能为正值，也可能为负值。很容易理解为什么在 Ni、Fe 和一些 Ni-Fe 合金中 ω H 为正，而 ω s 为负。如果将考虑电子间相关性的金森理论应用于分子场系数，则 ω H 在 0°K 时为正值。迄今为止，除稀铁合金外，还没有发现低温下具有负ω H 的金属铁磁体。给出了将态密度与受迫体积磁致伸缩和自发体积磁致伸缩联系起来的图示。
Pressure dependence of spontaneous magnetization and forced- and spontaneous-volume magnetostriction in itinerant electron ferromagnets at 0°K are formulated. Dependence on atomic volume of the band width and of the molecular field coefficient are taken into account. It is shown that the spontaneous volume magnetostriction ω s , must be negative when the forced one ω H , is negative while the former may be positive or negative when the latter is positive. It is easily understood why ω H is positive or whereas ω s is negative in Ni, Fe and some Ni-Fe alloys. If Kanamori's theory considering the correlation between electrons is applied to the molecular field coefficient, then ω H is positive at 0°K. So far has been found no metallic ferromagnets with negative ω H at low temperature, with an exception of dilute Fe-alloys. Diagrammatic representation to relate the density of states to forced- and spontaneous-volume magnetostriction is given.