NMR Investigation of the localized and delocalized Nature of Uranium Compounds

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(1) From the detailed NMR measurements for Sn and In nuclei in typical uranium compounds, USn_3 and UIn_3, we have clarified that an antiferromagnetic spin fluctuation is playing the essential role of the electronic state of high temperatures. (2) ^<27>Al NMR shift and relaxation studies have clarified an d-wave superconductivity in newly developed Np compound, NpPd_5Al_2. It is also found that high temperature spin dynamics is highly anisotropic, having dramatic decrease of the fluctuations along the c-axis at low temperature.