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Phys. Rev. Lett. 77 (1996) pp. 908-911
Unexpected Negative Exchange Splitting of the Fe(001) Image State
Istituto Nazionale di Fisica della Materia-Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano, Italy
School of Physics, University of Bath, BA2 7AY, United Kingdom
Abstract
We have observed a surprising negative exchange splitting of the n = 1
image-potential surface state at Fe(001) using spin resolved inverse
photoemission, indicating that the minority-spin level has a lower energy than
the majority-spin level. Calculations show the negative sign results
from two superimposing effects. A true reverse polarization of the image
state, which hybridizes with bulk bands, which is then enhanced by
matrix element effects in inverse photoemission.