Electron-Phonon Coupling in High-Temperature Cuprate Superconductors Determined from Electron Relaxation Rates
Electron-Phonon Coupling in High-Temperature Cuprate Superconductors Determined from Electron Relaxation Rates
复制标题
由电子弛豫率确定的高温铜酸盐超导体中的电子声子耦合
DOI：
10.1103/physrevlett.105.257001
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发表时间：
2010-12-13
影响因子：
8.6
通讯作者：
Mihailovic, D.
中科院分区：
文献类型：
--
作者：
Gadermaier, C.;Alexandrov, A. S.;Mihailovic, D.
我们确定电子弛豫时间，通过泵浦-探测光谱使用子15 fs脉冲的正常状态下的两个不同的铜氧化物超导体。我们表明，主要的弛豫过程是电子-声子相互作用，并提取其强度的测量，Eliashberg函数的二阶矩λ = 800 +/- 200 meV（2）的La 1.85 Sr 0.15 CuO 4和λ = 400 +/- 100 meV（2）的YBa 2Cu 3 O 6.5。这些值表明了电子-声子相互作用在超导配对机制中可能的基本作用。
We determined electronic relaxation times via pump-probe optical spectroscopy using sub-15 fs pulses for the normal state of two different cuprate superconductors. We show that the primary relaxation process is the electron-phonon interaction and extract a measure of its strength, the second moment of the Eliashberg function lambda = 800 +/- 200 meV(2) for La1.85Sr0.15CuO4 and lambda = 400 +/- 100 meV(2) for YBa2Cu3O6.5. These values suggest a possible fundamental role of the electron-phonon interaction in the superconducting pairing mechanism.