Behavior of vortices near twin boundaries in underdoped Ba(Fe1-xCox)2As2

被引：71
作者：
Kalisky, B. [1 ,2 ]
Kirtley, J. R. [1 ,2 ]
Analytis, J. G. [1 ,2 ,3 ]
Chu, J. -H. [1 ,2 ,3 ]
Fisher, I. R. [1 ,2 ,3 ]
Moler, K. A. [1 ,2 ,3 ,4 ]
机构：
[1] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[3] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy, Menlo Pk, CA 94025 USA
[4] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
来源：
PHYSICAL REVIEW B | 2011年 / 83卷 / 06期
基金：
美国国家科学基金会;
关键词：
HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; GRAIN-BOUNDARIES; SINGLE-CRYSTALS; PLANE SUPERCONDUCTIVITY; VORTEX STRUCTURE; YBA2CU3O7-DELTA; LATTICE; DEFECTS; DEPENDENCE;
D O I：
10.1103/PhysRevB.83.064511
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCox)(2)As-2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: They tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)(2)As-2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.
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页数：7
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