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物理学报. 2008, 57(4): 2543-2547.
doi: 10.7498/aps.57.2543.
电子型掺杂高温超导体La2-xCexCuO4飞秒时间分辨动力学研究
- 收稿日期: 2007-07-17
- 修回日期: 2007-09-14
- 刊出日期: 2008-04-25
摘要: 利用飞秒时间分辨光抽运探测技术研究了电子型掺杂La2-xCexCuO4(LCCO)高温超导材料的准粒子超快动力学过程.得到低温(TTc)、转变温度附近(0.7Tc≤T≤Tc)和高温(T>Tc)三个温区内的动力学行为.研究发
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关键词:
- 电子型掺杂高温超导体 /
- 飞秒时间分辨 /
- 准粒子 /
- 声子瓶颈
English Abstract
Femtosecond time-resolved dynamics in electron-doped high-Tc superconductor La2-xCexCuO4
- Received Date:
17 July 2007
- Accepted Date:
14 September 2007
- Published Online:
25 April 2008
Abstract: The quasiparticle dynamics in the electron-doped high-Tc superconductor La2-xCexCuO4 (LCCO) was investigated by ultrafast time-resolved optical pump-probe technique. We present results in three temperature regions: namely the low temperature (TTc) region, that around Tc(0.7Tc≤T≤Tc) and the high temperature (T>Tc) region. In general, there was a slowdown of the relaxation as the temperature decreases. However, the quasiparticle lifetime was found to exhibit a quasi-divergence as the temperature approached Tc from below. The relaxation time in normal state was much longer than what was expected for metallic relaxation, indicating the presence of a T-independent pseudogap. We have also observed picosecond rise component of photoinduced change in reflectivity ΔR/R in the electron-doped LCCO, which is attributed to the Cooper pair-breaking dynamics. The rise time became shorter as the temperature increased. The experimental results are analyzed by Rothwarf-Taylor model.
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