Mo4Ce4Al7C3 : A nanolamellar ferromagnetic Kondo lattice - CEA Grenoble Access content directly
Journal Articles Physical Review B Year : 2020

Mo4Ce4Al7C3 : A nanolamellar ferromagnetic Kondo lattice

Kanji Furuta
  • Function : Author
Takahiro Ito
  • Function : Author
Christine Opagiste
Michel Barsoum
Philippe Ohresser
Edwige Otero
Patrick Le Fèvre
François Bertran
  • Function : Author
  • PersonId : 771704
  • IdRef : 145355861


Herein we show that Mo4Ce4Al7C3, a recently discovered nanolamellar compound displaying mixed valence, combines Kondo lattice behavior with ferromagnetism. A sizeable magnetization is carried by 3p states of Al as evidenced by a strong x-ray magnetic circular dichroism signal at the K edge of aluminum, whereas no detectable signal was observed at the K edge of carbon and L2,3 edges of molybdenum. These results point out that the ferromagnetic behavior originates in the Ce atoms with 4 f 1 electronic configuration lying within the Al planes. The evolution with pressure of the mixed valence of Ce atoms in the Mo-C planes determined via Ce L3 x-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 Ce 4 f electron 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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hal-02994836 , version 1 (31-05-2023)



Maxime Barbier, Fabrice Wilhelm, Damir Pinek, Kanji Furuta, Takahiro Ito, et al.. Mo4Ce4Al7C3 : A nanolamellar ferromagnetic Kondo lattice. Physical Review B, 2020, 102 (15), pp.155121. ⟨10.1103/PhysRevB.102.155121⟩. ⟨hal-02994836⟩
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