摘要
GeFe2 O4 是一种单晶化合物 ,考虑到由 3个〈111〉方向之一的一个轴 ,从一个中心位置到另一个中心位置之间 ,以Fe2 +离子为中心离子和O2 - 为配体构成了三角 (C3v)对称体系 .利用不可约张量理论 ,建立了 3d4 3d6 离子三角(C3v)对称的晶体场和自旋相互作用哈密顿矩阵 ,因此 ,由完全对角化的晶体场和自旋 轨道相互作用哈密顿矩阵和电子顺磁共振理论公式求出单晶GeFe2 O4 中Fe2 +离子的电子顺磁共振零场分裂参量D和F a .并研究了自旋三重态对电子顺磁共振 (EPR)零场分裂的贡献 .结果显示自旋三重态对基态零场分裂的贡献是较强的 。
GeFe2O4 is a spinet-type compound in which the neighborhood of a Fe2+ ion has a trigonal symmetry with respect to an axis which is parallel to one of the three <111> direction, and varies from site to site. The crystal-field and spin-orbit complete Hamiltonian matrix of 3d(4)/3d(6) ions have been established by irreducible representation method, The zero-field splitting parameters D and F-alpha of Fe2+ ions in GeFe2O4 crystal are presented by using the crystal-field and spin-orbit interaction complete diagonalizing Hamiltonian matrix with the theory of electron paramagnetic resonance; at the same time, the contributions to zero-field splitting from spin-triplet state have been studied. The results show that the contributions to zero-field splitting from spin-triplet state are important and strong. The calculated results are in good agreement with the experimental data.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第9期2280-2283,共4页
Acta Physica Sinica
基金
国家教育部留学基金资助的课题~~
