Vortex lattice melting in two-dimensional superconductors in intermediate fields
Vortex lattice melting in two-dimensional superconductors in intermediate fields
复制标题
中间场二维超导体的涡晶格熔化
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
R. Ikeda
中科院分区：
文献类型：
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作者：
Taro Saiki;R. Ikeda
为了研究二维超导体中涡旋晶格熔化相变的场依赖性，通过扩展传统的最低朗道（LL）近似，将超导序参量的几个LL模（LL指数最高为6）纳入到二维Ginzburg-朗道（GL）模型中，进行了Monte Carlo模拟.结果发现，在低场，这是熟悉的弹性理论，几乎垂直的熔化线，只是达到包括高LL模式与LL指数小于5，并在高场熔化转变的一阶字符显着减弱与降低字段。然而，在GL模型的使用中，没有发现由六角液体干预的连续连续熔化图像的真正交叉。
To examine the field dependence of the vortex lattice melting transition in two-dimensional (2D) superconductors, Monte Carlo simulations of the 2D Ginzburg-Landau (GL) model are performed by extending the conventional lowest Landau level (LL) approximation to include several {it higher} LL modes of the superconducting order parameter with LL indices up to six. It is found that a nearly vertical melting line in lower fields, which is familiar within the elastic theory, is reached just by including higher LL modes with LL indices less than five, and that the first order character of the melting transition in higher fields is significantly weakened with decreasing the field. Nevertheless, a genuine crossover to the consecutive continuous melting picture intervened by a hexatic liquid is not found within the use of the GL model.