论文标题
Nern的响应，粘度和涡流液体的移动熵
Nernst response, viscosity and mobile entropy in vortex liquids
论文作者
论文摘要
在超导涡流的液体中，纵向热梯度会产生横向电场。该Nernst信号在中等温度和磁场上达到峰值，大概是涡流芯与超流体环境之间的熵差最大。在许多不同的超导体中，该峰振幅的相似性令人困惑。该峰可以在涡流液体的粘度与熵密度之比中吸收至最低。以$ \ frac {\ hbar} {k_b} $表示的单位表示，最低限度比普通液体中的一个数量级要大。此外，在涡旋芯中存放的熵与与移动磁通线结合的熵相同。由于正常的准粒子稳定交换，熵可以从涡旋芯泄漏。只要$ \fracΔ{e_f} $比率足够大，将在超导相干长度的距离内剥离其熵的缓慢涡流。
In a liquid of superconducting vortices, a longitudinal thermal gradient generates a transverse electric field. This Nernst signal peaks at an intermediate temperature and magnetic field, presumably where the entropy difference between the vortex core and the superfluid environment is largest. There is a puzzling similarity of the amplitude of this peak across many different superconductors. This peak can be assimilated to a minimum in the viscosity to entropy density ratio of the vortex liquid. Expressed in units of $\frac{\hbar}{k_B}$, this minimum is one order of magnitude larger than what is seen in common liquids. Moreover, the entropy stocked in the vortex core is \textit{not} identical to the entropy bound to a moving magnetic flux line. Due to a steady exchange of normal quasi-particles, entropy can leak from the vortex core. A slowly moving vortex will be peeled off its entropy within a distance of the order of a superconducting coherence length, provided that the $\fracΔ{E_F}$ ratio is sufficiently large.
