电子声波的电势：在超导状态下的急剧消失
Electric potential of the electron sound wave: Sharp disappearance in the superconducting state
摘要：
本文研究了电子声波（一种以费米速度传播的电子分布函数的扰动）在高纯镓单晶中感应的交流电势。电子声的电位和弹性分量表现出对电子弛豫速率的不同依赖性：电位的相位随着温度的增加而增加，弹性位移的相位随着温度的增加而减少。这种效果内的多频带模型，其中的潜在的归因于弹道准波，而弹性组件与零声波。我们观察到超导态的一个神秘性质：伴随晶格形变的所有势的表现，包括通常的声波，在T_c以下几乎以跳跃的方式消失。
英文摘要：
We study the ac electric potential induced by the electron sound wave (a perturbation of the electron distribution function propagating with the Fermi velocity) in single crystals of high purity gallium. The potential and the elastic components of the electron sound demonstrate qualitatively different dependencies on the electron relaxation rate: while the phase of the potential increases with temperature, the phase of elastic displacement decreases. This effect is explained within the multiband model, in which the potential is attributed to the ballistic quasiwave, while the elastic component is associated with the zero-sound wave. We observed a mysterious property of the superconducting state: all manifestations of the potential accompanying the lattice deformations, including usual sound wave, disappear below T_c in almost jumplike manner.
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