Kalisky B, Gitterman M, Shapiro B Ya, Shapiro I, Shaulov A, Tamegai T, Yeshurun Y
Institute for Superconductivity, Department of Physics, Bar-Ilan University, Ramat-Gan, Israel.
Phys Rev Lett. 2007 Jan 5;98(1):017001. doi: 10.1103/PhysRevLett.98.017001. Epub 2007 Jan 4.
We observed an oscillatory behavior, both in space and time, of the induction in Bi2Sr2CaCu2O8+delta crystals exposed to a steady magnetic field. This new "flux waves" phenomenon appears near the order-disorder vortex phase transition, under specific conditions of temperature and induction gradient. A theoretical description of this effect is based on two coupled equations: the Landau-Khalatnikov dynamic equation for the order parameter of the vortex phase transition and the diffusion equation for the time evolution of the magnetic induction. A linear stability analysis of these equations predicts an oscillatory instability characterized by a period and wavelength in accordance with the experimental results.
我们观察到，在Bi2Sr2CaCu2O8+δ晶体暴露于稳定磁场时，其感应在空间和时间上均呈现出振荡行为。这种新的“磁通波”现象出现在有序-无序涡旋相变附近，处于特定的温度和感应梯度条件下。对这种效应的理论描述基于两个耦合方程：用于涡旋相变序参量的朗道-哈拉特尼科夫动力学方程以及磁感应时间演化的扩散方程。对这些方程的线性稳定性分析预测出一种振荡不稳定性，其周期和波长与实验结果相符。
