J. Phys. Soc. Jpn. 75S (2006) pp. 44-46 |Previous Article| |Next Article| |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –
Hyperfine Interactions of NpFeGa5 Observed by 237Np and 57Fe Mössbauer Spectroscopy
Yoshiya Homma1,
Saburo Nasu1,2,
Akio Nakamura2,
Masami Nakada3,
Dai Aoki1,
Naoto Metoki2,
Etsuji Yamamoto2,
Hironori Sakai2,
Shugo Ikeda2,
Yoshinori Haga2,
Yoshichika Ōnuki2,4 and
Yoshinobu Shiokawa1,2
1Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313
2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
3Department of Materials Science, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
4Graduate school of Science, Osaka University, Toyonaka, Osaka 560-0043
237Np and 57Fe Mössbauer spectroscopy have been applied for the antiferromagnet NpFeGa5 (TN = 118 K). Hyperfine magnetic field Hhf at Fe nucleus of the NpFeGa5 reaches 20.0 ±0.5 kOe at 4.2 K. The existence of small quadrupole interaction at Fe sites just below TN was verified by a measurement of the spectrum in the applied field of 10 kOe. A correlation between the magnetic state and the electric field gradient implies that the origin of Hhf is not only due to the dipole field from magnetic Np atoms, but also from magnetic Fe atoms. Magnetic moment at Np atom is determined to be µNp = 0.94 µB by the 237Np Mössbauer spectrum at 10 K.
URL:
http://jpsj.ipap.jp/link?JPSJS/75S/44/
DOI: 10.1143/JPSJS.75S.44
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