Eu 4f states in EuPd2Si2 have been investigated by bulk-sensitive high-resolution photoemission spectroscopy at temperatures from 20 to 300K. A bulk Eu2+ 4f component is definitely distinguished from two surface components. As the temperature is increasing, the spectral intensity of bulk Eu2+ drastically increases around 150K, while that of bulk Eu3+ decreases. The bulk Eu3+ 4f component is shifted by 0.2eV from 100 to 200K. The changes associated with the valence transition of EuPd2Si2 are thus successfully observed in the temperature-dependent photoemission spectra.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering