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Mössbauer studies of neptunium intermetallics at high pressure

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Abstract

Using the 60keV Mössbauer transition in237Np high pressure experiments have been performed up to ∼85kbar between 4.2K and 200K on NpCo2Si2, NpAl2, NpOs2 and NpAs. The delocalization of 5f-electrons with reduced volume is most pronounced in NpOs2 and NpAl2, whereas NpCo2Si2 can be considered as a highly localized magnet. In NpAs 5f-hybridization with electrons of As is dominant. At pressures above ∼25kbar a new magnetic phase is formed.

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This work has been funded by the German Federal Minister for Research and Technology (BMFT) under contract Nr. 03-KA1TUM-4.

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Potzel, U., Schiessl, W., Potzel, W. et al. Mössbauer studies of neptunium intermetallics at high pressure. Hyperfine Interact 40, 421–424 (1988). https://doi.org/10.1007/BF02049132

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