Chemical pressure effects and valence fluctuations in Yb 0.6Ca 0.4Al 2 and YbAl 2 alloys: A photoemission investigation
Abstract
We present angle integrated X-ray photoemission studies of Yb 0.6Ca 0.4Al 2 and YbAl 2 alloys. Mixed valence behaviour was observed for Yb in both compounds with room temperature valence estimated at 2.28 ± 0.03 for Yb 0.6Ca 0.4Al 2 and 2.33 ± 0.03 for YbAl 2. The lower intermediate valence for Yb in the pseudo-binary compound Yb 0.6Ca 0.4Al 2 is related to chemical pressure effects. Results at liquid nitrogen temperature indicate further reduction (about 10%) in the trivalent state contribution.
- Publication:
-
Solid State Communications
- Pub Date:
- February 1988
- DOI:
- 10.1016/0038-1098(88)90377-8
- Bibcode:
- 1988SSCom..65..743A