Dynamic coupling of crystal-field and phonon states in YbPO4

被引：22
作者：
Loong, CK
Loewenhaupt, M
Nipko, JC
Braden, M
Boatner, LA
机构：
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Tech Univ Dresden, D-8027 Dresden, Germany
[3] Kernforschungszentrum Karlsruhe GmbH, Inst Nukl Festkorperphys, D-7500 Karlsruhe, Germany
[4] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
来源：
PHYSICAL REVIEW B | 1999年 / 60卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.60.R12549
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dynamic response of 4f-electron-lattice interactions in YbPO4 was characterized by neutron spectroscopy using single-crystal specimens. The Yb3+:F-2(7/2) ground multiplet shows broadened and overdamped energy levels. A coupling of the upper Gamma(6) and Gamma(7) states with optic phonons was observed 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].
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页码：R12549 / R12552
页数：4
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