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$$f$$-electron states in RPd$$_5$$Al$$_2$$ (R: Pr, Nd)

Metoki, Naoto  ; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Masuda, Takatsugu*; Matsuda, Masaaki*; Aczel, A. A.*; Songxue, C.*; Hong, T.*; Pajerowski, D.*; Fernandez-Baca, J. A.*; Kamazawa, Kazuya*; Ikeuchi, Kazuhiko*; Kajimoto, Ryoichi  ; Nakamura, Mitsutaka  ; Inamura, Yasuhiro 

In order to elucidate the 5$$f$$-electron states in the heavy electron superconductor NpPd$$_5$$Al$$_2$$, neutron scattering experiments of the rare earth based iso-structural family have been carried out. The observed crystal field excitations of PrPd$$_5$$Al$$_2$$ and NdPd$$_5$$Al$$_2$$ were analyzed via the crystal field Hamiltonian with tetragonal symmetry, diagonalized analytically. The experimentally obtained crystal field parameters $$A_{lm}$$were very similar in CePd$$_5$$Al$$_2$$, PrPd$$_5$$Al$$_2$$, and NdPd$$_5$$Al$$_2$$, indicating a common effective charge potential in this series. We succeeded to clarify the 5$$f$$ electron states of NpPd$$_5$$Al$$_2$$ and UPd$$_5$$Al$$_2$$ in comparison with these results.

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