Articolo in rivista, 2007, ENG, 10.1103/PhysRevB.75.235109
Doyle, BP; Carleschi, E; Magnano, E; Malvestuto, M; Dee, AA; Wills, AS; Janssen, Y; Canfield, PC
CNR, INFM, Lab Nazl TASC, I-34012 Basovizza, TS, Italy; Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy; Sincrotrone Trieste SCpA, I-34012 Basovizza, TS, Italy; Univ Coll London, Dept Chem, London WC1H 0AJ, England; Royal Inst Great Britain, Davy Faraday Res Lab, London W1S 4BS, England; Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France; Iowa State Univ, Ames Lab, Ames, IA 50011 USA
We have determined the ytterbium valence as a function of temperature in the reported near-zero thermal expansion material YbGaGe using x-ray photoemission at various incident photon energies. The Yb 3d, 4d, and 4f levels, which directly yield the Yb valence, have been measured. Careful analysis enabled the clear separation of surface and bulk contributions. Resonant photoemission at the 4d-4f absorption edge was used to enhance the low contribution of the Yb3+ component. Contrary to the initially proposed Yb valence transition, we find no change in the valence from room temperature down to 115 K.
Physical review. B, Condensed matter and materials physics 75
ZERO THERMAL-EXPANSION, X-RAY SOURCE, YB COMPOUNDS, PHOTOEMISSION-SPECTROSCOPY, SINGLE-CRYSTALS
Carleschi Emanuela, Doyle Bryan Patrick, Magnano Elena
ID: 1455
Year: 2007
Type: Articolo in rivista
Creation: 2009-06-16 00:00:00.000
Last update: 2012-04-26 22:44:03.000
CNR institutes
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:1455
DOI: 10.1103/PhysRevB.75.235109
ISI Web of Science (WOS): 000247624900046