(237)Np 的 Mössbauer 效应研究在 NpFeAsO 上。
(237)Np Mössbauer effect study on NpFeAsO.
机构信息
European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, 76125 Karlsruhe, Germany. Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Hans-Sommer-Str. 10, D-38106 Braunschweig, Germany.
出版信息
J Phys Condens Matter. 2014 Apr 16;26(15):156002. doi: 10.1088/0953-8984/26/15/156002. Epub 2014 Mar 27.
We report (237)Np Mössbauer measurements on NpFeAsO. The Np atoms were found to occupy only one crystallographic site. The value of the isomer shift (δ ∼ 9.1 mm s(-1) versus NpAl2) indicates a 5f(4) electronic configuration (Np(3+) ions). The magnetic ordering of the Np sublattice below 60 K is established and the saturated ordered magnetic moment is determined to be 1.73μB at 3.6 K. The unique set of hyperfine parameters exclude a modulated magnetic structure or spin waves on the Np site. The neptunium magnetic moments μNp are found to lie along the tetragonal c-axis.
我们报告了 (237)Np Mössbauer 测量在 NpFeAsO 上的结果。Np 原子被发现仅占据一个晶体学位置。同核异能位移值（δ∼9.1 mm s(-1) 与 NpAl2 相比）表明其具有 5f(4) 电子构型（Np(3+) 离子）。在 60 K 以下，Np 亚晶格的磁有序被确定，在 3.6 K 时饱和有序磁矩被确定为 1.73μB。独特的超精细参数集排除了 Np 位上的调制磁结构或自旋波。发现钚磁矩 μNp 沿着四方 c 轴排列。
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