Spin and orbital moments in itinerant magnets
Spin and orbital moments in itinerant magnets
复制标题
流动磁体中的自旋矩和轨道矩
DOI：
10.1209/epl/i2001-00409-9
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发表时间：
2001
期刊：
影响因子：
1.8
通讯作者：
R. Troć
中科院分区：
文献类型：
--
作者：
A. Hiess;F. Boudarot;S. Coad;P. Brown;P. Burlet;G. Lander;M. Brooks;D. Kaczorowski;A. Czopnik;R. Troć
具有大轨道力矩的巡回磁铁是不常见的。我们发现UGa 3是一种由5f态携带巡游磁性的材料。明确的证据来自中子衍射测量的磁化强度分布，其中观察到的散射振幅的动量依赖性的显着差异以上和以下TN。反铁磁序出现时磁化强度分布的变化是由于大原子5f自旋和TN以下的轨道矩的反平行耦合，而TN以上有自旋简并和没有无序的本地矩。
Itinerant magnets with large orbital moments are uncommon. We show that UGa3 is such a material where the itinerant magnetism is carried by the 5f states. The definitive evidence comes from neutron diffraction measurements of the magnetization distribution, where a significant difference is observed in the momentum dependence of the scattering amplitude above and below TN. The change in the magnetization distribution when the antiferromagnetic order appears is due to the antiparallel coupling of large atomic 5f spin and orbital moments below TN, whereas above TN there is spin degeneracy and no disordered local moments.