XANES study of rare-earth valency in LRu4P12 (L = Ce and Pr)

Citation
Ch. Lee et al., XANES study of rare-earth valency in LRu4P12 (L = Ce and Pr), PHYS REV B, 60(19), 1999, pp. 13253-13256
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
0163-1829 → ACNP
Volume
60
Issue
19
Year of publication
1999
Pages
13253 - 13256
Database
ISI
SICI code
0163-1829(19991115)60:19<13253:XSORVI>2.0.ZU;2-I
Abstract
Valency of Ce and Pr in LRu4P12 (L=Ce and Pr) was studied by L-2,L-3-edge x -ray absorption near-edge structure: (XANES) spectroscopy. The Ce-L-3 XANES spectrum suggests that Ce is mainly trivalent, but the 4f state strongly h ybridizes with ligand orbitals. The band gap of CeRu4P12 seems to be formed by strong hybridization of 4f electrons. Pr-L-2 XANES spectra indicate tha t Pr exists in trivalent state over a wide range in temperature, 20 K less than or equal to T less than or equal to 300 K. We find that the metal-insu lator (MI) transition at T-MI = 60 K in PrRu4P12 does not originate from Pr valence fluctuation. [S0163-1829(99)01244-8].