含柱状缺陷的层状BSCCO中玻色玻璃相到布拉格玻璃相过渡的蒙特卡罗模拟
Monte Carlo Simulation of the Crossover from Bose Glass to Bragg Glass Phase in Layered BSCCO with Columnar Defects
摘要：
分层BSCCO样品的蒙特卡罗模拟被用来调查涡旋物质在低场的行为，特别是与可能发生的布拉格玻璃（BrG）相在低密度的柱状缺陷，一种现象，其特征在于流行的短距离超过长程序。在这个无位错的拓扑相位中，平移阶关联函数显示幂律衰减。对于磁感应$B=0.1$ kG的第一个布拉格峰的平面结构因子，六角序参量，和德劳内三角的数据分析表明，作为柱状缺陷的密度降低，\textit{crossover}（或过渡）从玻色玻璃BrG相发生在这个\textit{highly anisotropic}高T ${}_c$超导体。最重要的是，分析的{低温}三维涡-涡关联函数的结构因子，计算通过鞍点的方法和使用的数值数据作为输入，提供了明确的证据的{}幂律衰减的{发散}布拉格峰在BrG阶段，一个基本的功能，这是不明确的验证，只有在各向同性化合物。
英文摘要：
Monte Carlo simulations of layered BSCCO samples are used to investigate the behavior of vortex matter at low fields, particularly in connection with the possible occurrence of a Bragg glass (BrG) phase at low density of columnar defects, a phenomenon characterized by the prevalence of short-range over long-range order. In this dislocation-free topological phase the translational order correlation function displays a power law decay. For magnetic induction $B=0.1$ kG the analysis of the data for the first Bragg peak of the planar structure factor, the hexatic order parameter, and the Delaunay triangulation shows that, as the density of columnar defects is lowered, a \textit{crossover} (or transition) from Bose glass to BrG phase takes place in this \textit{highly anisotropic} high-T${}_c$ superconductor. Most importantly, an analysis of the {low-temperature} 3D vortex-vortex correlation function in terms of the structure factor, calculated via a saddle point approach and the use of the numerical data as input, provides clear-cut evidence of {the} power law decay of the {divergent} Bragg peaks in the BrG phase, a fundamental feature that was inequivocally verified only in isotropic compounds.
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