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Resonant X-ray magnetic scattering experiments have been performed on a single crystal of Ce(Fe{0.93}Co{0.07})2 . With small Co doping the antiferromagnetic state is stabilised at low temperature, together with a rhombohedral distortion. We show by the azimuthal dependence of the scattered X-ray intensity at the L3 edge of Ce the Ce moments appear to lie parallel to the rhombohedral axis of distortion of the single domain probed. This result would be in disagreement with the accepted collinear spin arrangement from neutron-diffraction experiments. As a result, we re-analyse the neutron data to show that a possible model consistent with both experimental results involves a non-collinear arrangement of Fe spins. Introducing the dynamical aspect of this concept into the physics of CeFe2 may allow to understand how the frustrations of the Fe tetrahedral leads to the appearance of antiferromagnetic fluctuations in the presence of ferromagneticsm.

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Authors: PAOLASINI L, ESRF, Grenoble (FR);OULADDIAF B, Institut Laue Langevin, Grenoble (FR);LANDER G.H, EITU JRC, Karlsruhe (DE);CANFIELD P, EITU JRC, Karlsruhe (DE);BERNHOEFT N, DRFMC,SPSMS CEA-Grenoble (FR)
Bibliographic Reference: An oral report given at: International Conference on Strongly Correlated Electron Systems (SCES 2001). Held in: Ann Arbor (US), 6-10 August (2001)
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