Title: 237Np M össbauer effect study on NpFeAsO
Authors: GACZYNSKI PiotrKLIMCZUK TomaszWALKER H.c.SPRINGELL R.COLINEAU EricELOIRDI RachelGRIVEAU Jean-ChristopheCACIUFFO Roberto
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER vol. 26 no. 15 p. 156002
Publisher: IOP PUBLISHING LTD
Publication Year: 2014
JRC N°: JRC88058
ISSN: 0953-8984
URI: http://iopscience.iop.org/0953-8984/26/15/156002/article
http://publications.jrc.ec.europa.eu/repository/handle/JRC88058
DOI: 10.1088/0953-8984/26/15/156002
Type: Articles in periodicals and books
Abstract: We report 237Np M össbauer measurements on NpFeAsO. The Np atoms were found to occupy only one crystallographic site. The value of the isomer shift (IS 9.1 mm/s vs NpAl2) indicates a 5f4 electronic configuration (Np3+ ions). The magnetic ordering of the Np sublattice below 60 K is established and the saturated ordered magnetic moment is determined to be 1.73 _B 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 _Np are found to lie along the tetragonal c-axis.
JRC Directorate:Nuclear Safety and Security

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