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TT: Fachverband Tiefe Temperaturen
TT 4: f-Electron Systems
TT 4.9: Vortrag
Montag, 18. März 2024, 12:00–12:15, H 3005
The valence and magnetism of Ce in Mo4Ce4Al7C3 nanolamellar ferromagnetic Kondo lattice — •Fabrice Wilhelm1, Maxime Barbier1,2, Thierry Ouisse2, Daniel Braithwaite3, Christine Opagiste4, and Andrei Rogalev1 — 1ESRF, Grenoble, France — 2LMGP, Grenoble, France — 3IRIG-CEA, Grenoble, France — 4CNRS, Grenoble, France
Rare-earth-based nanolaminates have attracted attention motivated by their potential as precursors for the synthesis of two-dimensional (2D) magnetic materials. Their intricate magnetism is governed by the strong interplay of the orbital and valence degrees of freedom that gives rise to a multitude of ground states. Herein we present the results of thorough study of the electronic and magnetic properties of Mo4Ce4Al7C3, exploiting X-ray absorption near edge spectroscopy and X-ray magnetic circular dichroism. This system orders ferromagnetically below 10.5 K [1] and allows for mechanical exfoliation being a derivative of the well-known MAX phases. The element-selective studies and magnetoresistance measurements under pressure evidenced that this mixed valent compound combines a Kondo lattice behavior with ferromagnetism [2]. We have shown that this unusual property is due to very different electronic and magnetic properties of the two non-equivalent Ce sites.
[1] Q. Tao et al., Phys. Rev. Mater. 2 (2018) 114401.
[2] M. Barbier et al., Phys. Rev. B 102 (2020) 155121
Keywords: Rare-earth-based nanolaminates; Cerium; XANES; XMCD