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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Femtosecond Spectroscopy of Relaxation Processes in Metals and High-T_c Superconductors
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Femtosecond Spectroscopy of Relaxation Processes in Metals and High-T_c Superconductors

机译：飞秒光谱的金属和高T_c超导体弛豫过程

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摘要

Spectral dependences of charge carrier relaxation rates, γ_(e-e)(hω) and γ_(e-ph)(hω), were observed in Au and Cu films and YBa_2Cu_3O_(7-δ) high-T_c superconductor films. The relaxation rates decreased substantially in the spectral region corresponding to interband transitions to the Fermi level region (hω_(Au) = 2.45 eV, hω_(Cu) = 2.15 eV, and hω_1 = 1.89 eV and hω_2 = 2.08 eV for YBa_2Cu_3O_(7-δ)). This relaxation deceleration opens up possibilities for developing a new method, based on the spectral dependences of relaxation rates, for the determination of the Fermi level position and the parameters of electron-electron and electron-phonon interactions on the one hand and for studying deviations from the Fermi-liquid behavior in strongly correlated electronic systems. The linear γ_(e-e)(hω) ∝ |hω - E_F| spectral dependence was observed for a YBa_2Cu_3O_(7-δ) film near hω_2 = 2.08 eV, which may be evidence of a non-Fermi-liquid behavior of the electronic subsystem.
机译：在Au和Cu薄膜以及YBa_2Cu_3O_（7-δ）高T_c超导薄膜中观察到了载流子弛豫率γ_（e-e）（hω）和γ_（e-ph）（hω）的光谱依赖性。对于与YBa_2Cu_3O_（7- δ））。这种弛豫减速为基于弛豫率的光谱相关性开发一种新方法，一方面确定费米能级位置以及确定电子-电子和电子-声子相互作用的参数以及研究与强相关电子系统中的费米-液行为。线性γ_（e-e）（hω）∝ |hω-E_F |在hω_2= 2.08 eV附近观察到YBa_2Cu_3O_（7-δ）薄膜的光谱依赖性，这可能是电子子系统的非费米液体行为的证据。

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