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The dynamics of the cubic Laves phase ferromagnet UFe(2)(T(c)= 165 K) have recently been reported up to a maximum energy transfer of approximately 7 meV. The most surprising aspect is the strong Fe-Fe interactions as judged by the dispersion of the Fe only mode, and the absence of any observable mode involving the U 5f electrons. Using the IN8 triple-axis spectrometer at the Institut Laue Langevin (ILL) these measurements have now been extended to approximately 20 meV. The steep dispersion observed at low energy continues to approximately 10 meV. Between 11 and 17 meV the Fe mode is broad and difficult to observe, and it appears to interact with another mode, almost certainly nuclear (phonon) in origin. Above 17 meV the mode is observed again, although with a reduced dispersion.

Additional information

Authors: PAOLASINI L, CEA, CEN Saclay, Gif-sur-Yvette (FR);CACIUFFO R, Dipartimento di Scienze dei Materiali e della Terra, Università di Ancona (IT);ROESSLI B, Institut Laue Langevin, Grenoble (FR);LANDER G H, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: International Conference on Neutron Scattering, Toronto (CA), August 17-21, 1997
Availability: Available from (1) as Paper EN 41023 ORA
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