期刊
APPLIED PHYSICS LETTERS
卷 94, 期 20, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3137164
关键词
barium compounds; flux pinning; grain boundaries; Hall effect; high-temperature superconductors; scanning probe microscopy; superconducting thin films; yttrium compounds
资金
- Air Force MultiUniversity Research Initiative (MURI)
- Center for Probing the Nanoscale (CPN)
- NSF NSEC
- NSF [PHY-0425897]
- U. S.-Israel Binational Science Foundation (BSF)
- EU-Contract [EU FP7 ERC-AdG]
We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa2Cu3O6+delta thin films in the presence of an applied current. Detecting the motion of individual vortices allowed us to probe the current-voltage (I-V) characteristics of the grain boundary with voltage sensitivity below a femtovolt. We find a very sharp onset of dissipation with V proportional to I-n with an unprecedented high exponent of n approximate to 290 that shows essentially no dependence on temperature or grain boundary angle. Our data have no straightforward explanation within the existing grain boundary transport models.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据