La2-xSrxCuO4薄膜中静摩擦力随等待时间的变化
Static Friction as a Function of Waiting Time Probed by Dynamics of Driven Vortices in La2-xSrxCuO4 Thin Films
摘要：
我们研究了高$T_c$超导体中驱动涡旋的动力学，作为研究摩擦物理的理想模型系统。测量了不同结构、样品尺寸和钉扎力的La $_{2-x}$ Sr $_x$ CuO $_4$薄膜的最大静摩擦力$F_s(t_w)$与等待时间的关系。我们在$B$ - $T$相图和不同类型的样品中发现了各种类型的$F_s(t_w)$。结果表明，钉扎强度、涡束尺寸和系统尺寸对热涨落弛豫有很大影响。在此基础上，我们找到了确定阿蒙顿-库仑定律成立的关键条件，并提出了一个判据。
英文摘要：
We investigated the dynamics of driven vortices in high-$T_c$ superconductor as an ideal model system to study the physics of friction. The waiting-time dependence of the maximum static friction force, $F_s(t_w)$, was measured in La$_{2-x}$Sr$_x$CuO$_4$ thin films with different structures, sample sizes and pinning force. We found various kinds of $F_s(t_w)$ in the $B$-$T$ phase diagram and in different types of samples. The results suggest that the relaxation by thermal fluctuation is strongly affected by the pinning strength, the vortex bundle size and the system size. Based on these results, we found crucial conditions to determine the validity of the Amontons-Coulomb's law, and proposed a criterion.
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