Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors.
Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors.
复制标题
II 型超导体中涡流与超声波的相互作用以及声法拉第效应。
DOI：
10.1103/physrevb.53.6682
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Bishop
中科院分区：
文献类型：
--
作者：
Domínguez;Bulaevskii;Ivlev;Maley;Bishop
我们研究了第二类超导体中声波与涡旋的相互作用，同时考虑了涡旋和晶体位移之间的钉扎力和电动力学。我们提出超声技术作为一种方法，用于获得有关涡流动力学的信息。这是特别appropiate在低温下的传输测量是无效的。由于涡流引起的声速和衰减的变化，可以分别提供关于涡流系统的弹性常数和关于涡流耗散的信息。在低温下，作用在涡旋上的马格努斯力导致声学法拉第效应：沿着磁场传播的横向声波的偏振面旋转。这种效应在马格努斯力和磁场中是线性的，对于平行于c轴的场，具有等效的a和B轴。我们讨论如何可以测量这种效果的脉冲回波技术或驻波声波。此外，我们表明，交流电磁场作用于涡旋系统可以产生超声波。我们计算的线性政权所产生的声波的振幅，并与最近的实验进行比较。\textcopyright{} 1996美国物理学会。
We study the interaction of sound waves with vortices in type-II superconductors, taking into account pinning and electrodynamic forces between vortices and crystal displacements. We propose ultrasound techniques as a method for obtaining information about vortex dynamics. This is particularly appropiate at low temperatures where transport measurements are ineffective. The changes in sound velocity and attenuation due to vortices, can provide information on the elastic constants of the vortex system and on vortex dissipation, respectively. At low temperatures the Magnus force acting on vortices leads to the acoustic Faraday effect: there is a rotation of the polarization plane of tranverse sound waves propagating along the magnetic field. This effect is linear in the Magnus force and magnetic field in crystals with equivalent a and b axes for a field parallel to the c axis. We discuss how this effect can be measured by means of either pulse-echo techniques or standing sound waves. Also, we show that an ac electromagnetic field acting on the vortex system can generate ultrasound. We calculate the amplitude of the generated sound waves in the linear regime and compare with recent experiments. \textcopyright{} 1996 The American Physical Society.