First-Order Magnetic Phase Transitions in Itinerant Electron Ferromagnets

First-Order Magnetic Phase Transitions in Itinerant Electron Ferromagnets
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流动电子铁磁体中的一阶磁相变

DOI：
10.1143/jpsj.79.083707
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发表时间：
2010
期刊：
J. Phys. Soc. Jpn.
影响因子：
--
通讯作者：
Y. Takahashi
Y. Takahashi
中科院分区：
--
文献类型：
--
作者：
Y. Hirata;M. Nakajima;T. Suemoto;H. Tajima;Y. Hirata;M. Nakajima;T. Suemoto;H. Tajima;Y. Takahashi

文献摘要

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提出了具有类伊辛磁各向异性的巡游电子弱铁磁体的自旋涨落模型。根据巡游电子磁体理论，研究了磁化率和自发磁矩随温度的变化关系。与各向同性情况相比，由于临界点附近热自旋涨落幅度的过度抑制，阻碍了自发磁矩的持续减小，模型中的磁跃迁变为一阶磁跃迁.
A spin fluctuation model is proposed for itinerant electron weak ferromagnets with Ising-like magnetic anisotropy. According to our theory of itinerant electron magnets, the temperature dependence of the magnetic susceptility and the spontaneous magnetic moment is studied. In contrast to those in isotropic cases, magnetic transitions in the model become of first order because of the oversuppression of thermal spin fluctuation amplitude around the critical point that hinders the spontaneous moment to diminish continuously.