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首页> 外文期刊>Physica, C. Superconductivity and its applications >Phase transitions in a two-dimensional vortex lattice with defects: Monte Carlo simulation
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Phase transitions in a two-dimensional vortex lattice with defects: Monte Carlo simulation

机译：带有缺陷的二维涡旋晶格中的相变：蒙特卡洛模拟

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Phase diagrams and phase transitions in a two-dimensional vortex lattice with defects have been investigated by Monte Carlo (MC) simulation techniques. It was found that in the presence of defects, the melting of the vortex lattice proceeds in two stages. First, the ideal triangular lattice transforms at low temperature into islands, which are pinned to the defects and rotate around them (''rotating lattice'' phase). Then, at a higher temperature, the boundaries of the "vortex lattice islands" become smeared and the system transforms into a vortex liquid. The dependencies of phase transition temperatures on pinning potential have been obtained. The visual pictures of the flux lattice structures have been calculated. The current-voltage characteristics (IVC) of the vortex structures with defects in forms of points, lines and squares were simulated at different temperatures and defects concentration. We have found that the point defects are more efficient than the other type of defects with equivalent specific concentration. It was shown that the dependencies of critical current on temperature and defects' concentrations are directly associated with the phase state of the vortex system. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 19]
机译：蒙特卡罗（MC）仿真技术已经研究了带有缺陷的二维涡旋晶格中的相图和相变。发现在存在缺陷的情况下，涡旋晶格的熔化分两个阶段进行。首先，理想的三角形晶格在低温下转变成孤岛，这些孤岛固定在缺陷上并围绕缺陷旋转（“旋转晶格”相）。然后，在更高的温度下，“涡流晶格岛”的边界变得模糊，并且系统转变为涡流液体。已经获得了相变温度对钉扎电势的依赖性。已计算出通量晶格结构的视觉图像。在不同温度和缺陷浓度下，模拟了具有点，线和正方形形式的缺陷的涡流结构的电流-电压特性（IVC）。我们已经发现，点缺陷比具有相同特定浓度的其他类型的缺陷更有效。结果表明，临界电流对温度和缺陷浓度的依赖性与涡流系统的相态直接相关。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：19]

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