We investigate the effect of many-body interactions on the spin–orbit coupling of anisotropic metals. We use the underscreened Anderson lattice model that was proposed to describe uranium and plutonium compounds. By using a rotationally invariant approximation, we show that Coulomb interactions induce off-diagonal correlations that enhance the components of the spin–orbit coupling. Even modest values of the Coulomb interaction U can enhance the spin–orbit coupling by factors of about 4 and have significant effects on the electronic spectrum, but the enhancements are most pronounced for systems that are on the verge of magnetic instabilities. The enhancement is anisotropic in crystals with non-cubic symmetries and can lead to giant magnetic anisotropies in paramagnetic states.

我们研究了多体相互作用对各向异性金属的自旋轨道耦合的影响。我们使用未充分筛选的安德森晶格模型，该模型被提议用于描述铀和钚化合物。通过使用旋转不变近似，我们表明库仑相互作用会引起非对角相关，从而增强自旋轨道耦合的分量。即使库仑相互作用U 的适度值也可以将自旋轨道耦合增强约 4 倍，并对电子光谱产生显着影响，但对于处于磁不稳定性边缘的系统，这种增强作用最为明显。这种增强在具有非三次对称性的晶体中是各向异性的，并可能导致顺磁态的巨大磁各向异性。