Magnetic and Fermi surface properties of the ferromagnetic compound UGa2
Magnetic and Fermi surface properties of the ferromagnetic compound UGa2
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DOI：
10.1143/jpsj.69.2647
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发表时间：
2000-08-01
影响因子：
1.7
通讯作者：
Onuki, Y
中科院分区：
文献类型：
--
作者：
Honma, T;Inada, Y;Onuki, Y
我们研究了铁磁体UGa_2的磁性和费米面性质。电阻率、弹性常数、热膨胀系数、热电势、磁化率和霍尔系数等均表现出高度的各向异性，反映出六方结构。讨论了基于局域5 f电子性质的5 f（2）-和5 f（3）-CEF方案，以理解磁化率和磁化数据。我们还做了磁电阻和de Haas-van Alphen（dHvA）实验来研究费米表面的性质。这两个数据都非常复杂，这意味着费米面是一个多连通的。它们既不能用定域的5 f（2）和5 f（3）核模型来解释，也不能用自旋极化的5 f巡游模型来解释。回旋质量很轻，在0.17 ~ 6.2m（0）之间，与电子比热系数11 mJ/K ~（-2）·mol ~（-1）相符。
We have studied the magnetic and Fermi surface properties in a ferromagnet UGa2. The electrical resistivity, elastic constant, thermal expansion coefficient: thermoelectric power, magnetic susceptibility and Hall coefficient indicate highly anisotropic properties, reflecting the hexagonal-structure. The 5f(2)- and 5f(3)-CEF schemes, based on the localized 5f-electron nature, are discussed to understand the magnetic susceptibility and magnetization data. We have also done the magnetoresistance and de Haas-van Alphen (dHvA) experiments to investigate the Fermi surface properties. Both data are very complicated, implying that the Fermi surface is a multiply-connected one. They are explained neither by the localized 5f(2)- and 5f(3)-core models nor by the spin-polarized 5f-itinerant model. The cyclotron mass is, however, rather light, ranging from 0.17 to 6.2 m(0), which is consistent with the electronic specific heat coefficient of 11mJ/K-2.mol.