Magnon-Enhanced Phonon Damping at Gd(0001) and Tb(0001) surfaces

被引：0
|
作者：
Melnikov, Alexey [1 ]
Povolotskiy, Alexey [2 ]
Bovensiepen, Uwe [1 ]
机构：
[1] Free Univ Berlin, Fachbereich Phys, Arnimallee 14, D-14195 Berlin, Germany
[2] St Petersburg State Univ, Inst Laser Res, St Petersburg 199034, Russia
来源：
ULTRAFAST PHENOMENA XVI | 2009年 / 92卷
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Damping of coherent phonons at Gd(0001) and Tb(0001) surfaces is investigated by optical femtosecond time-resolved second harmonic generation. At low temperatures the damping rate increases monotonous with temperature. Close to the Curie temperature the phonon damping rate features an anomalous decrease, which is more pronounced for Tb than for Gd. This systematic variation is based on the difference in orbital momentum of the elements and identifies phonon-magnon scattering as the origin of the anomaly.
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页码：244 / +
页数：2
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