Mossbauer Spectroscopic Study of Neptunium Compounds

镎化合物的穆斯堡尔光谱研究

• 批准号: 17540311
• 负责人: HOMMA Yoshiya
• 金额: $ 2.18万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540311/
• 关键词: Mossbauer Spectroscopy; Magnetism; Neptunium; Actinide; Hyperfine Field; Magnetic Structure; 5f electron; Electronic State; メスバウアー分光; ^<237>Np; ^<57>Fe; NpFeGa_5; 四極子相互作用; 磁気モーメント

Mossbauer spectroscopy has been performed for the neptunium compounds, which were made by flux method. Especially, We applied the Np-237 Mossbauer spectroscopy, which was used only for the complex compounds in Japan, to elucidate the electronic and magnetic state of NpTGa_5. Fe-57 Mossbauer spectroscopy was adapted to NpFeGa_5, in which Fe sites also has magnetic moment in addition to Np sites. NpFeGa5 becomes antiferromagnet below 117 K and Hyperfine field reaches to 1.9 T at 4.2 K. This result consists with the neutron diffraction experiment by Metoki et al. Hyperfine field at Np sites was determined as 204 T indicating that Np atom has a magnetic moment of 0.94 μ_B.Physical properties such as electrical resistivity, magnetic susceptibility and specific heat have measured for these compounds.

对用通量法制备的镎化合物进行了穆斯堡尔光谱分析。特别地，我们应用了日本仅用于复杂化合物的Np-237穆斯堡尔谱分析了NpTGa_5的电子和磁态。Fe-57穆斯堡尔谱适用于NpFeGa_5，其中除了Np位点外，Fe位点也具有磁矩。NpFeGa5在117k以下变为反铁磁体，在4.2 K时超细场达到1.9 T。这一结果与Metoki等人的中子衍射实验结果一致。结果表明，Np原子的磁矩为0.94 μ_B。测量了这些化合物的电阻率、磁化率和比热等物理性质。

项目成果

Magnetic and Fermi Surface Properties in NpIn3

NpIn3 的磁性和费米表面特性

• DOI: 10.1143/jpsj.75.084710
• 发表时间: 2006
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: D. Aoki;Y. Homma;H. Sakai;S. Ikeda;Y. Shiokawa;E. Yamamoto;A. Nakamura;Y. Haga;R. Settai;Y. Ōnuki
• 通讯作者: Y. Ōnuki

de Haas-van Alphen effect in NpCoGa5

NpCoGa5 中的德哈斯-范阿尔芬效应

• 发表时间: 2005
• 期刊: Physica B 359
• 作者: S.Mori;J.Tokunaga;Y.Horibe;Y.Aikawa;T.Katsufuji;Dai Aoki;Dai Aoki;Dai Aoki;Dai Aoki;青木 大;Dai Aoki
• 通讯作者: Dai Aoki

Hyperfine Interactions of NpFeGa5Observed by237Np and57Fe Mössbauer Spectroscopy

237Np 和 57Fe 穆斯堡尔谱观察 NpFeGa5 的超精细相互作用

• DOI: 10.1143/jpsjs.75s.44
• 发表时间: 2006
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: Y. Homma;S. Nasu;A. Nakamura;M. Nakada;D. Aoki;N. Metoki;E. Yamamoto;H. Sakai;S. Ikeda;Y. Haga;Y. Ōnuki;Y. Shiokawa
• 通讯作者: Y. Shiokawa

Magnetic structure and successive phase transition in NpRhGa5

NpRhGa5 的磁性结构和连续相变

• DOI: 10.1016/j.physb.2006.01.503
• 发表时间: 2006
• 期刊: Physica B-condensed Matter
• 影响因子: 2.8
• 作者: S. Jonen;N. Metoki;F. Honda;K. Kaneko;D. Aoki;Y. Homma;E. Yamamoto;Y. Haga;Y. Shiokawa;Y. Ōnuki
• 通讯作者: Y. Ōnuki

^237Np and ^57FeMossbauer study of NpFeGa_5

NpFeGa_5 的 ^237Np 和 ^57FeMossbauer 研究

• 发表时间: 2006
• 期刊: Hyperfine Interactions 168・1-3
• 作者: Y.Homma;S.Nasu;A.Nakamura;M.Nakada;D.Aoki;N.Metoki;E.Yamamoto;H.Sakai;S.Ikeda;Y.Haga;Y.Onuki;Y.Shiokawa
• 通讯作者: Y.Shiokawa