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Report No.

M$"o$ssbauer and magnetic study of neptunyl(+1) complexes

Nakamoto, Tadahiro*; Nakamura, Akio; Takeda, Masuo*

From the middle of 1990s, the $$^{237}$$Np M$"o$ssbauer and magnetic study on neptunyl(+1, +2) complexes has started at Japan Atomic Energy Research Institute (the present Japan Atomic Energy Agency). The studies of our group have revealed that, through unique interplay of strong uniaxial electric field of the yl-oxygens and the strong spin-orbit coupling of the 5f-electron systems, they exhibit intriguing common feature as an Ising-type neptunyl(+1)-molecular magnet and yet diverse character depending on the specific neptunyl(+1) CCB network structure from a Curie-para- to ferro- and meta-magnets. In this chapter, a part of our studies, especially for $$^{237}$$Np M$"o$ssbauer and magnetic study of neptunyl(+1) complexes, is reviewed.



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