"Herein we show thatMo4Ce4Al7C3, a recently discovered nanolamellar compound displaying mixed valence, combines Kondo lattice behavior with ferromagnetism. A sizeable magnetization is carried by3pstates of Al as evidenced by a strong x-ray magnetic circular dichroism signal at theKedge of aluminum, whereas no detectable signal was observed at theKedge of carbon andL2,3edges of molybdenum. These results point out that the ferromagnetic behavior originates in the Ce atoms with4f1electronic configuration lying within the Al planes. The evolution with pressure of the mixed valence of Ce atoms in the Mo-C planes determined via CeL3x-ray-absorption spectra along with the magnetoresistance measurements across the ferromagnetic transition unambiguously reveal a Kondo behavior. Angle-resolved photoemission spectroscopy and density functional theory confirm a certain degree of Ce4felectron delocalization. More generally, conduction electrons are not restricted to lie in the MoC planes but are also delocalized in the Al planes."
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