Magnon-enhanced phonon damping at Gd(0001) and Tb(0001) surfaces using femtosecond time-resolved optical second-harmonic generation

被引：21
|
作者：
Melnikov, A. [1 ]
Povolotskiy, A. [2 ]
Bovensiepen, U. [1 ]
机构：
[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
[2] St Petersburg State Univ, Laser Res Inst, St Petersburg 198504, Russia
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 24期
关键词：
D O I：
10.1103/PhysRevLett.100.247401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Damping of coherent optical phonons is investigated by femtosecond time-resolved second-harmonic generation at Gd(0001) and Tb(0001) surfaces. At low temperature the damping rate increases monotonically with temperature, but close to the Curie point the damping rate is strongly reduced. We explain this behavior by phonon-magnon scattering originating from spin-orbit coupling proven by a larger effect for Tb than for Gd. Consideration of phonon-electron and phonon-phonon scattering shows that magnon-mediated damping is dominant almost up to the Curie temperature.
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页数：4
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