Dynamic coupling of crystal-field and phonon states in YbPO4

Authors
Loong, CK Loewenhaupt, M Nipko, JC Braden, M Boatner, LA
Citation
Ck. Loong et al., Dynamic coupling of crystal-field and phonon states in YbPO4, PHYS REV B, 60(18), 1999, pp. R12549-R12552
Citations number
42
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
60
Issue
18
Year of publication
1999
Pages
R12549 - R12552
Database
ISI
SICI code
0163-1829(19991101)60:18<R12549:DCOCAP>2.0.ZU;2-4
Abstract
The dynamic response of 4f-electron-lattice interactions in YbPO4 was chara cterized by neutron spectroscopy using single-crystal specimens. The Yb3+:F -2(7/2) ground multiplet shows broadened and overdamped energy levels. A co upling of the upper Gamma(6) and Gamma(7) states with optic phonons was obs erved throughout the Brillouin zone, resulting in a strong renormalization of the bare crystal-field and phonon excitation spectra over the 15 to 475 K temperature range. A mechanism involving monopolar fluctuations of the Yb f orbital is proposed. [S0163-1829(99)50642-5].