Repozytorium publikacji - Politechnika Gdańska

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.

Autorzy

• P. Gaczyński,
• prof. dr hab. inż. Tomasz Klimczuk link otwiera się w nowej karcie ,
• H. Walker,
• R. Springell,
• E. Colineau,
• R. Eloirdi,
• J-C. Griveau,
• R. Caciuffo