We report 237Np Mössbauer 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.
GACZYNSKI Piotr;
KLIMCZUK Tomasz;
WALKER H.C.;
SPRINGELL R.;
COLINEAU Eric;
ELOIRDI Rachel;
GRIVEAU Jean-Christophe;
CACIUFFO Roberto;
2014-04-01
IOP PUBLISHING LTD
JRC88058
0953-8984,
http://iopscience.iop.org/0953-8984/26/15/156002/article,
https://publications.jrc.ec.europa.eu/repository/handle/JRC88058,
10.1088/0953-8984/26/15/156002,
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