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Unconventional magnetism and superconductivity in the ternary actinide compounds AnPd$$_5$$Al$$_2$$

アクチノイド化合物における新規な磁性と超伝導

芳賀 芳範   

Haga, Yoshinori

AnPd$$_5$$Al$$_2$$ compounds (An = rare earths and actinides) crystallize in the tetragonal ZrNi$$_2$$Al$$_5$$-type structure. Among them, NpPd$$_5$$Al$$_2$$ is the first Np compound that shows heavy fermion superconductivity. The strongly Pauli-limited upper critical fields (Hc$$_2$$) reflecting the magnetic anisotropy and the first-order phase transition at Hc$$_2$$ are very similar characteristics as observed in other heavy fermions. Detailed magnetic and superconducting study for these compounds including new experimental developments particularly for the transuranium compounds will be discussed.

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