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Analysis of ion-irradiation induced lattice expansion and ferromagnetic state in CeO$$_{2}$$ by using Poisson distribution function

Yamamoto, Yuki*; Ishikawa, Norito  ; Hori, Fuminobu*; Iwase, Akihiro*

The lattice constant and the magnetic state of CeO$$_{2}$$ are modified by the irradiation with 200 MeV Xe ions. Under the assumption that these modifications are induced in the narrow one-dimensional region (the ion track) along the ion beam path, the dependence of the lattice constant and the saturation magnetization of CeO$$_{2}$$ on the Xe ion fluence can be analyzed by using the Poisson distribution function. The analysis reveals that the lattice constant inside the ion track, which is larger than outside the ion track is not affected by the overlapping of the ion track. The present result implies that the Poisson distribution function is useful for describing the effect of ion track overlapping on the ion irradiation induced ferromagnetic state in CeO$$_{2}$$.

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