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Valence state determines the band magnetocrystalline anisotropy in 2D rare-earth/noble-metal compounds
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Valence state determines the band magnetocrystalline anisotropy in 2D rare-earth/noble-metal compounds
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Paper
Valence state determines the band magnetocrystalline anisotropy in 2D rare-earth/noble-metal compounds
2022
Overview
In intermetallic compounds with zero-orbital momentum (\\(L=0\\)) the magnetic anisotropy and the electronic band structure are interconnected. Here, we investigate this connection on divalent Eu and trivalent Gd intermetallic compounds. We find by X-ray magnetic circular dichroism an out-of-plane easy magetization axis in 2D atom-thick EuAu\\(_2\\). Angle-resolved photoemission and density-functional theory prove that this is due to strong \\(f-d\\) band hybridization and Eu\\(^{2+}\\) valence. In contrast, the easy in-plane magnetization of the structurally-equivalent GdAu\\(_2\\) is ruled by spin-orbit-split \\(d\\)-bands, notably Weyl nodal lines, occupied in the Gd\\(^{3+}\\) state. Regardless of the \\(L\\) value, we predict a similar itinerant electron contribution to the anisotropy of analogous compounds.
Publisher
Cornell University Library, arXiv.org
