Dichroisme magnétique circulaire dans CeFe2 par diffusion inélastique de rayons x résonnante

X-ray magnetic circular dichroism of CeFe2 by resonant inelastic x-ray scattering
PHYSICAL REVIEW B 81, 180404R (2010)
N. Jaouen, S. G. Chiuzbăian, C. F. Hague, R. Delaunay, C. Baumier, J. Lüning, A. Rogalev, G. Schmerber, and J.-P. Kappler

We have measured the Ce L x-ray magnetic circular dichroism (XMCD) in ferromagnetic CeFe2 using the partial fluorescence yield given by the Ce 2p3d resonant inelastic x-ray scattering (RIXS) spectrum. The lifetime broadening of the 3d core hole is four times smaller than that of the Ce 2p core hole providing improved resolution over earlier experiments. Clear evidence for a 4f2, 4f1, 4f0 strongly mixed-valent ground state is observed confirming, by and large, impurity Anderson model predictions which take into account the RIXS XMCD geometrical dependence.

(a) RIXS amplitude at \omega_k_'=4839.3 and 4835.7 eV as a function of \omega_k ; (b) Ce L3 XAS recorded in TFY mode (lower case letters indicate energies used to record RIXS spectra) and XMCD (top panel). PFY spectra taken at \omega_k_'=4839.3 and 4835.7 eV and XMCD (lower panel) ; (c ) predicted RIXS XMCD adapted from [1]. Symbols are a guide to the \omega_k values at which an XMCD resonance is predicted to occur when \omega_k_'=4839.3 eV.

[1] K. Asakura, A. Kotani, and I. Harada, J. Phys. Soc. Jpn. 74, 1328 (2005).