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Spin-polarized resonant surface state in (1 1 1) Sm1-x Gd x Al2, a zero-magnetization ferromagnet
M Bersweiler1, K Dumesnil1, Y Fagot-Revurat1
1Institut Jean Lamour (UMR CNRS 7198), Université de Lorraine, 54000 Nancy, France.
Abstract:
The electronic structure of (1 1 1) Sm1-x Gd x Al2, a zero-magnetization ferromagnet, is investigated by angle- and spin- resolved photoemission spectroscopy. An intense electron pocket strongly localized around [Formula: see text] and close to the Fermi level is observed and analyzed in detail. Its various characteristics, combined with electronic structure calculations, reveal a resonant surface state of 5d character and Λ1 symmetry, likely built on bulk states developing around L points. It exhibits moreover a low temperature positive spin polarization at the Fermi level, of strong interest for spin-dependent transport properties in Sm1-x Gd x Al2-based spintronic devices.
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