Abstract
Resonant X-ray magnetic scattering experiments have been performed on a single crystal of Ce(Fe0.93Co0.07)2. With small Co doping the antiferromagnetic state is stabilized 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 that 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-analyze 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 one to understand how the frustration of the Fe tetrahedra leads to the appearance of antiferromagnetic fluctuations in the presence of ferromagnetism.
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