论文标题
缓慢的电子 - 音波弛豫控制超导电阻过渡的动力学
Slow electron-phonon relaxation controls the dynamics of the superconducting resistive transition
论文作者
论文摘要
我们研究了通过薄薄外延锡膜中电压波动测量访问的超导电阻过渡的电阻波动（$ r $ - 覆盖）的时间和空间尺度。该材料的特征是慢电子 - 音波松弛，这使它远远超出了超导波动的教科书方案的适用性范围。 $ r $ - 汇合的测得的Lorentzian光谱标识了它们的相关时间，在整个过渡区域几乎是恒定的，并且与常规的Ginzburg-Landau时间尺度无关。取而代之的是，相关时间与通过电子 - 音波松弛和通过扩散到储层的弛豫确定的能量松弛时间一致。我们的数据在定量上与自发温度波动的模型一致，并突出了对具有缓慢的电子 - 音波弛豫材料中电阻过渡的理解。
We investigate the temporal and spatial scales of resistance fluctuations ($R$-fluctuations) at the superconducting resistive transition accessed through voltage fluctuations measurements in thin epitaxial TiN films. This material is characterized by a slow electron-phonon relaxation, which puts it far beyond the applicability range of the textbook scenario of superconducting fluctuations. The measured Lorentzian spectrum of the $R$-fluctuations identifies their correlation time, which is nearly constant across the transition region and has no relation to the conventional Ginzburg-Landau time scale. Instead, the correlation time coincides with the energy relaxation time determined by a combination of the electron-phonon relaxation and the relaxation via diffusion into reservoirs. Our data is quantitatively consistent with the model of spontaneous temperature fluctuations and highlight the lack of understanding of the resistive transition in materials with slow electron-phonon relaxation.
