Evidence for divalency at the surface of Sm metal from electron-energy-loss spectroscopy
- 1 March 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 25 (5) , 3374-3376
- https://doi.org/10.1103/physrevb.25.3374
Abstract
Valence change at the surface of samarium metal is observed by probing the "free-electron density" via plasmon excitation in electron-energy-loss spectroscopy using primary energies 100-1000 eV. With the contrasting of the Sm spectra with those of trivalent erbium an intense plasmon feature at 7 eV, observed at low primary energies, is shown to be due to divalent surface character in Sm.Keywords
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