Abstract
Epitaxial γ-Ce thin films, stabilised at low temperatures when sandwiched by W(110) buffer and capping layers, have been studied by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) in a temperature range of 5–300 K and with an applied magnetic field μ 0 H=0–7 T, at the M 4,5 edges on the beamline ID12B at ESRF. The mean 4f occupancy, n f, was found to be intermediate to that of α and γ-phases, which is proposed to arise from an increase of the valence at the W/Ce interface. In addition, a reversible decrease of n f is observed when the temperature is decreased from which we estimate a bulk Ce Kondo temperature T K=150 K. The XMCD shows that Ce is Curie–Weiss paramagnetic down to the lowest examined temperature with small | θ p|<10 K in contrast to the high T K obtained from the XAS.
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