Hyperfine Interactions of NpFeGa5Observed by237Np and57Fe Mössbauer Spectroscopy
Hyperfine Interactions of NpFeGa5Observed by237Np and57Fe Mössbauer Spectroscopy
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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
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发表时间：
2006
影响因子：
1.7
通讯作者：
Y. Shiokawa
中科院分区：
文献类型：
--
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
对反铁磁体NpFeGa5(TN=118K)进行了237Np和57Fe穆斯堡尔谱研究。在4.2K时，NpFeGa5铁核的超精细磁场HHf达到20.0±0.5kOe。通过在10kOe的外加磁场测量，证实了在TN以下的Fe位存在小的四极相互作用。磁态与电场梯度之间的关系表明，HHF的起源不仅源于磁性Np原子的偶极场，也源于磁性Fe原子的偶极场。用237Np穆斯堡尔谱测定了10K时Np原子的磁矩为µNp=0.94µB。
237 Np and 57 Fe Mossbauer spectroscopy have been applied for the antiferromagnet NpFeGa 5 ( T N = 118 K). Hyperfine magnetic field H hf at Fe nucleus of the NpFeGa 5 reaches 20.0 ±0.5 kOe at 4.2 K. The existence of small quadrupole interaction at Fe sites just below T N 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 H hf 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 µ Np = 0.94 µ B by the 237 Np Mossbauer spectrum at 10 K.