Field-Driven Coupling Transition in the Vortex State of Irradiated Bi 2 Sr 2 CaCu 2 O 8 : Computer Simulation Study
Field-Driven Coupling Transition in the Vortex State of Irradiated Bi 2 Sr 2 CaCu 2 O 8 : Computer Simulation Study
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辐照 Bi 2 Sr 2 CaCu 2 O 8 涡旋态场驱动耦合跃迁：计算机模拟研究
DOI：
10.1103/physrevlett.80.2925
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发表时间：
1998
影响因子：
8.6
通讯作者：
M. Tachiki
中科院分区：
文献类型：
--
作者：
R. Sugano;T. Onogi;K. Hirata;M. Tachiki
采用基于Lawrence-Doniach模型的蒙特卡罗模拟方法，研究了重离子辐照引入柱状缺陷时高碳超导体bi2sr2cacu2o8的涡流相图。在有限温度下，当临界场B/B Φ低于匹配场B Φ的1/3处时，在磁场驱动下，“煎饼”涡对缺陷的俘获率发生了不连续转变。旋涡液相的转变伴随着层间相干性的不连续跳跃，其中解耦的旋涡液相沿缺陷出现部分耦合。
We examine a vortex phase diagram for high-T c superconductor Bi 2 Sr 2 CaCu 2 O 8 when columnar defects are introduced by heavy-ion irradiation, by using Monte Carlo simulation based on the Lawrence-Doniach model. At finite temperatures, we numerically find a magnetic-field-driven discontinuous transition in the trapping rate of “pancake” vortices to the defects, at a critical field of B/B Φ≃ 1/3 below the matching field B Φ. The transition in the vortex liquid phase is accompanied by a discontinuous jump of the interlayer coherence, where the decoupled vortex liquid appears to partially couple along the defects.