Highly spin-polarized, nearly free-electron states in front of Co(101¯0)
- 14 February 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (7) , 1072-1075
- https://doi.org/10.1103/physrevlett.72.1072
Abstract
We report on the first observation of highly spin-polarized nearly free-electron image-potential states. At the surface Brillouin zone boundary Y¯ of Co(101¯0) spin-polarized inverse photoemission reveals large exchange splittings of 125 meV and 96 meV for two n=1 image states, separated by 0.6 eV due to the surface corrugation potential. The exchange splittings are nearly as large as the intrinsic linewidths so that electrons trapped in these two-dimensional states are highly spin polarized. By their large exchange splitting these image states serve as a test case for a possible spin dependence of the surface-barrier potential.Keywords
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