A silicene-based 4f magnet probed by X-ray photoemission spectroscopy

Nazin, V. G.; Lebedev, Mikhail V.; Chumakov, Ratibor G.; Averyanov, Dmitry V.; Sokolov, Ivan S.; Parfenov, Oleg E.; Kondratev, O. A.; Tokmachev, Andrey M.; Storchak, Vyacheslav G.

doi:10.1016/j.jallcom.2023.171078

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“…A half of the 4f-states are empty; the other half lying below the Fermi level provides the magnetic moments in play (in particular, they give rise to the SQUID signal). In EuSi 2 , a magnetic material isostructural and isoelectronic to GdAlSi, there was a controversy regarding the position of the 4f-states; it is resolved by a recent X-ray photoelectron spectroscopy (XPS) study in favor of 4f-states lying deep under the Fermi level . Both systems are predicted to be metals.…”

Section: Resultsmentioning

confidence: 99%

“…In EuSi 2 , a magnetic material isostructural and isoelectronic to GdAlSi, there was a controversy regarding the position of the 4f-states; it is resolved by a recent X-ray photoelectron spectroscopy (XPS) study in favor of 4f-states lying deep under the Fermi level. 65 Both systems are predicted to be metals. Various related magnetic compounds�silicides 16,20 and germanides 21 of Eu and Gd, GdScSi, and GdScGe 66 �are metals.…”

Section: ■ Introductionmentioning

confidence: 99%

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Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi

Averyanov,

Sokolov,

Taldenkov

et al. 2024

J. Am. Chem. Soc.

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Layered magnets are stand-out materials because of their range of functional properties that can be controlled by external stimuli. Regretfully, the class of such compounds is rather narrow, prompting the search for new members. Graphitizationstabilization of layered graphitic structures in the 2D limitis being discussed for cubic materials. We suggest the phenomenon to extend beyond cubic structures; it can be employed as a viable route to a variety of layered materials. Here, the idea of graphitization is put into practice to produce a new layered magnet, GdAlSi. The honeycomb material, based on graphene-like layers AlSi, is studied both experimentally and theoretically. Epitaxial films of GdAlSi are synthesized on silicon; the critical thickness for the stability of the layered polymorph is around 20 monolayers. Notably, the layered polymorph of GdAlSi demonstrates ferromagnetism, in contrast to the nonlayered, tetragonal polymorph. The ferromagnetism is further supported by electron transport measurements revealing negative magnetoresistance and the anomalous Hall effect. The results show that graphitization can be a powerful tool in the design of functional layered materials.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%