Matching effect of vortex lattice in Bi2Sr2CaCu2O8+y with artificial periodic defects
Matching effect of vortex lattice in Bi2Sr2CaCu2O8+y with artificial periodic defects
复制标题
DOI：
10.1016/j.physc.2005.02.139
复制
发表时间：
2005-10
影响因子：
1.7
通讯作者：
S. Ooi;T. Mochiku;Shan Yu;E. S. Sadki;K. Hirata
中科院分区：
文献类型：
--
作者：
S. Ooi;T. Mochiku;Shan Yu;E. S. Sadki;K. Hirata
为了研究人工周期钉钉中心对高t {sub c}超导体中涡旋物质的影响，我们测量了以三角形晶格形式分布的具有亚微米孔的Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y}单晶的局部磁化强度和电阻。两个测量结果都显示了匹配效应，匹配场的倍数是由缺陷阵列的晶格间距计算出来的。在没有人为缺陷的情况下，观察到匹配效应的最大场要大于旋涡-晶格熔化转变的场。结果表明存在一种面内有序的涡旋液相。
To study the influence of artificial periodic pinning centers on the vortex matter in high-T {sub c} superconductors, we have measured the local magnetization and the electrical resistance of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+y} single crystals with sub-micron holes, which are distributed as a triangular lattice. Both measurements show matching effects in multiples of the matching field calculated from the lattice spacing of the defect array. The maximum field in which the matching effect is observed is larger than the field of the vortex-lattice melting transition in samples without artificial defects. The results suggest the existence of a kind of vortex liquid phase which has an in-plane order.