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Surprisingly, Np(2)Rh(2)Sn does not order magnetically whereas the uranium counterpart U(2)Rh(2)Sn orders antiferromagnetically at 24 K with a 5f moment micro(U) = 0.38 micro(B). The magnetic and electronic properties of (U(1-x)Np(x))(2)Rh(2)Sn solid solutions have been investigated. For x = 0.25 and 0.5, the ordering temperature decreases to 11 K whereas the Np-rich compound (x = 0.75) shows the onset of magnetic order around T = 6 K. The average Np magnetic moment amounts to 0.84 micro(B), 0.83 micro(B) and 0.25 micro(B) respectively. The isomer shift slightly decreases, from -9.6 mm/s to -10.4 mm/s (versus NpAl(2)) as x increases. The values of the quadruple interaction parameter in the ordered and paramagnetic state suggest that Np moments are parallel to c for x = 0.25 and the rotate to the basal plane for higher x.

Additional information

Authors: COLINEAU E ET AL, JRC, Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An oral report given at: The 12th International Conference on Hyperfine Interactions, Park City, UT (US), 12-17 August 2001
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