Dimensional crossover in collective flux pinning.
Dimensional crossover in collective flux pinning.
复制标题
集体磁通钉扎中的维度交叉。
DOI：
10.1103/physrevb.34.494
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Kes
中科院分区：
文献类型：
--
作者：
Woerdenweber;Kes
临界电流实验厚（d-italic = 5- 18. Mu.. m）非晶Nb/sub 3/Ge或Mo/sub 3/Si薄膜在0.8B-italic/sub c-italic//sub 2/附近的钉扎力F-italic/sub p-italic/显著增加。这个峰值的出现是由磁通线晶格的二维到三维无序的交叉触发的，这发生在对数相关长度L-italic/sub c-italic/近似为d-italic/2时。大的钉扎力和不寻常的非线性V-italic-I-italic特性表明，在三维区域，L-italic/subc-italic/是由磁通线晶格的缺陷，这是非常不稳定的。
Critical-current experiments on thick (d-italic = 5--18 ..mu..m) films of amorphous Nb/sub 3/Ge or Mo/sub 3/Si reveal a dramatic increase of the pinning force F-italic/sub p-italic/ at fields around 0.8B-italic/sub c-italic//sub 2/. The onset of this peak is triggered by a crossover from two- to three-dimensional disorder of the flux-line lattice, which occurs when the logitudinal correlation length L-italic/sub c-italic/ is approximately d-italic/2. The large pinning force and the unusual nonlinear V-italic-I-italic characteristics show that in the three-dimensional regime, L-italic/sub c-italic/ is determined by defects of the flux-line lattice which are extremely unstable.