A Microscopic Model for Ferromagnetism of UGe2
A Microscopic Model for Ferromagnetism of UGe2
复制标题
UGe2铁磁性的微观模型
DOI：
10.1143/jpsj.73.1576
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Ueda
中科院分区：
文献类型：
--
作者：
K. Hirohashi;K. Ueda
考虑到5-f电子的轨道简并性，我们构造了UGe 2铁磁性的微观哈密顿量，并通过Hartree-Fock近似研究了可能的相.我们通过假设垂直于c轴的共面磁矩整体上构成a轴磁矩的磁序来减少要确定的平均值的数量。由于轨道简并，晶体电场项和跳跃项的各向异性相互竞争。此外，原子在各轨道上的占据数对晶体电场和库仑相互作用之间的关系很敏感。由此得到了具有不同铁磁级的丰富的基态相图。
We construct a microscopic Hamiltonian for the ferromagnetism of UGe 2 by taking account of the orbital degeneracy of the 5-f electrons and investigate possible phases by the Hartree–Fock approximation. We reduce the number of mean values to be determined by assuming the magnetic orders where the coplanar magnetic moments perpendicular to the c -axis constitute an a -axis moment as a whole. Because of the orbital degeneracy, the anisotropies of the crystalline electric field term and the hopping term competes with each other. Moreover occupation number in each atomic orbit is sensitive to the relation between the crystalline electric field and the Coulomb interaction. In consequence, a rich ground state phase diagram with various different ferromagnetic orders is obtained.