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The dispersion curves of the Fe spin-wave mode have been measured in the itinerant ferromagnet CeFe(2)(T(C)=235K) using the IN8 triple-axis spectrometer at the Institut Laue Langevin (ILL). The only mode observed is that involving the Fe sublattice. The Fe mode has a gap of approximately 1 meV at the magnetic zone centre, which is independent of temperature, and the spin-wave stiffness is approximately 120 meV-Angstrom squared at small q, a value more than a factor of two smaller than in YFe(2) and all other isostructural rare-earth-Fe(2) compounds. The most unusual feature is that the dispersion along the [111] direction has another minimum at q = (1/2 1/2 1/2). This observation implies that there are also strong antiferromagnetic fluctuations in this material.

Additional information

Authors: DERVANAGAS P, CEA, CEN Grenoble (FR);PAOLASINI L, CEA, CEN Saclay, Gif-sur-Yvette (FR);HIESS A, Institut Laue Langevin, Grenoble (FR);LANDER G H, JRC Karlsruhe (DE);CANFIELD P, Ames Laboratory, Iowa State University (US)
Bibliographic Reference: Paper presented: International Conference on Neutron Scattering, Toronto (CA), August 17-21, 1997
Availability: Available from (1) as Paper EN 41024 ORA
Record Number: 199711581 / Last updated on: 1997-12-09
Original language: en
Available languages: en