(237)Np Mössbauer effect study on NpFeAsO

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 esta...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-04, Vol.26 (15), p.156002-156002
Main Authors: Gaczyński, P, Klimczuk, T, Walker, H, Springell, R, Colineau, E, Eloirdi, R, Griveau, J-C, Caciuffo, R
Format: Article
Language:English
Subjects:
Arsenicals - chemistry
Electron Spin Resonance Spectroscopy
Ferric Compounds - chemistry
Magnetics
Neptunium - analysis
Neptunium - chemistry
Spectroscopy, Mossbauer
Temperature
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Summary: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.
ISSN:1361-648X
DOI:10.1088/0953-8984/26/15/156002