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Following the successful experiments on uranium compounds observing the resonant magnetic scattering at the M edge photon energy, the experiments have been extended to neptunium. The sample used for these experiments was a 12 mg `flake' of a single crystal of NpAs which was encapsulated in a small beryllium cell to fulfil all the necessary safety requirements. The measurement on NpAs lasted for only 3.5 days so that a full study of the complicated phase diagram was not possible. Some time was spent examining the incommensurate-commensurate phase transition. Also observed were the higher harmonics, 3rd and 5th order, in the state with q less than 0.25. Finally, critical magnetic scattering near T(N) could be observed. This experiment was in the nature of a test, particularly of the encapsulation procedures and whether the resonance would be strong enough to detect in Np. Further experiments are planned.

Additional information

Authors: LANGRIDGE S, University of Keele (GB);STIRLING W, University of Keele (GB);LANDER G H, JRC Karlsruhe (DE);REBIZANT J, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);GIBBS D, Brookhaven National Laboratory, New York (US)
Bibliographic Reference: Paper presented: 22. Journées des Actinides, Méribel (FR), April 22-24, 1992
Availability: Text not available
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