Microscopic Approach to Magnetism and Superconductivity of f-Electron Systems with Filled Skutterudite Structure

In order to gain a deep insight into f -electron properties of filled skutterudite compounds from a microscopic viewpoint, we investigate the multiorbital Anderson model including Coulomb interactions, spin–orbit coupling, and crystalline electric field effect. First we examine the local f -electron state in detail in comparison with the results of L S and j – j coupling schemes. For each case of n =1–13, where n is the number of f electrons per rare-earth ion, the model is analyzed by using the numerical renormalization group (NRG) method to evaluate magnetic susceptibility and entropy of f electron. In particular, for the f 2 -electron system corresponding to the Pr-based filled skutterudite, it is found that magnetic fluctuations significantly remain at low temperatures, even when the ground state is Γ 1 singlet, if Γ 4 (2) triplet is the excited state with small excitation energy. In order to make further step to construct a simplified model which can be treated even in a periodic system, we also anal...

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