Crossover between the classical friction and the nano-scale friction investigated by the transient dynamics of vortices in La2-xSrxCuO4 thin films
Crossover between the classical friction and the nano-scale friction investigated by the transient dynamics of vortices in La2-xSrxCuO4 thin films
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通过 La2-xSrxCuO4 薄膜中涡流的瞬态动力学研究经典摩擦与纳米级摩擦之间的交叉
DOI：
10.1088/1742-6596/150/5/052181
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
A. Maeda
中科院分区：
文献类型：
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作者：
D. Nakamura;S. Kitamura;A. Maeda
我们从摩擦物理学的角度研究了高温超导体中驱动涡流的动力学。首先，对于所有样品，我们发现在玻璃-液体转变线以下，最大静摩擦力与临界电流密度成正比，具有明显的等待时间依赖性。这表明涡流的动力学就像纳米级（微观）摩擦，其中经常发生弛豫。随着温度降低，等待时间依赖性消失，这意味着涡流动力学变成了经典（宏观）摩擦，其中很少发生松弛。弛豫现象的交叉线取决于桥的尺寸。根据本文获得的结果，我们提出了一个区分宏观摩擦和微观摩擦的通用参数。
We investigated the dynamics of driven vortices in high-Tc superconductor from the viewpoint of the physics of friction. First of all, for all samples, we found the obvious waiting-time dependence of the maximum static friction force which is proportional to the critical current density, below the glass-liquid transition line. This indicates that the dynamics of vortices is like the nano-scale(microscopic) friction, where the relaxation occurs frequently. As temperature decreased, the waiting-time dependence dissapeared, impling that the vortex dynamics became that of classical(macroscopic) friction, where the relaxation rarely occurs. The crossover line of the relaxation phenomena depended on the bridge size. From the results obtained in this paper, we propose a universal parameter which discriminates the macroscopic friction from the microscopic friction.
琼脂凝胶的静摩擦：摩擦界面处接触结的形成
DOI：
--
发表时间：
2005
期刊：
J.Phys.Society of Japna 74
影响因子：
--
作者：
Masataka Ohta;Tomoyuki Miyamoto;Tetsuya Matsuura;Yasutaka Matsui;Tatsuya Furuhata;Takahiro Iwasaki;Yoshihiro Kashihara;Fumio Koyama;V.Z.Mordkovich;T.Nitta
通讯作者：
T.Nitta