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237Np Mössbauer Investigations of (U1−x Np x )2Rh2Sn

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Abstract

Surprisingly, Np2Rh2Sn does not order magnetically whereas the uranium counterpart U2Rh2Sn orders antiferromagnetically at 24 K with a 5f moment μ U ≈0.38μ B . We have investigated the magnetic and electronic properties of (U1−x Np x )2Rh2Sn solid solutions. 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 μ B ,0.83μ B and 0.25 μ B respectively. The isomer shift slightly decreases, from −9.6 mm/s to −10.4 mm/s (versus NpAl2) as x increases. The values of the quadrupole interaction parameter in the ordered and paramagnetic state suggest that Np moments are parallel to c for x=0.25 and then rotate to the basal plane for higher x.

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Authors and Affiliations

  1. Joint Research Centre, Institute for Transuranium Elements (ITU), European Commission, Postfach 2340, 76125, Karlsruhe, Germany

    E. Colineau, P. Boulet, F. Wastin & J. Rebizant

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  1. E. Colineau
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  2. P. Boulet
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  3. F. Wastin
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  4. J. Rebizant
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Colineau, E., Boulet, P., Wastin, F. et al. 237Np Mössbauer Investigations of (U1−x Np x )2Rh2Sn. Hyperfine Interactions 136, 409–414 (2001). https://doi.org/10.1023/A:1020581515110

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