Spatially resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBa2Cu3O7-δ -: art. no. 092506

被引：14
|
作者：
Luo, CW [1 ]
Shih, PT
Chen, YJ
Chen, MH
Wu, KH
Juang, JY
Lin, JY
Uen, TM
Gou, YS
机构：
[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30050, Taiwan
[2] Natl Chiao Tung Univ, Inst Phys, Hsinchu 30050, Taiwan
来源：
PHYSICAL REVIEW B | 2005年 / 72卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.72.092506
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The spatially resolved relaxation characteristics of photoinduced quasiparticles (QPs) in CuO2 planes of underdoped YBCO are disclosed by polarized fs time-resolved spectroscopy. The relaxation time (tau) along b axis diverges at T-c, and appears to be governed by a temperature-dependent gap Delta(T) at T < T-c. Furthermore, for T>T-c, a monotonic increase of tau with decreasing T along the b axis and ab diagonal was observed and can be attributed to a temperature-independent gap Delta(p). The results lend support to the recombination dominant scenario of QP dynamics. However, the QP thermalization may take part along the nodal direction in the highly underdoped samples.
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页数：4
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