Abstract
Synchrotron-radiation-excited photoelectron spectroscopy is employed to study the bulk and surface states of the mixed-valent system Eu, which undergoes a valence transition from at room temperature to at low temperature (≲ 100 K). The high resolution employed, coupled with a relatively large bulk-to-surface energy shift to the emission, allows a definitive identification of the bulk and surface states of . The emission is not observed at room temperature, but is readily apparent in the low-temperature spectra.
- Received 30 September 1981
DOI:https://doi.org/10.1103/PhysRevB.25.1446
©1982 American Physical Society