We report 237Np 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 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 1.73μB 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.
Authors
- P. Gaczyński,
- prof. dr hab. inż. Tomasz Klimczuk link open in new tab ,
- H. Walker,
- R. Springell,
- E. Colineau,
- R. Eloirdi,
- J-C. Griveau,
- R. Caciuffo
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1088/0953-8984/26/15/156002
- Category
- Publikacja w czasopiśmie
- Type
- artykuł w czasopiśmie wyróżnionym w JCR
- Language
- angielski
- Publication year
- 2014
Source: MOSTWiedzy.pl - publication "237Np Mössbauer effect study on NpFeAsO" link open in new tab
