237Np Mössbauer effect study on NpFeAsO
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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