Enhancing the critical current of a superconducting film in a wide range of magnetic fields with a conformal array of nanoscale holes

The maximum current (critical current) a type-II superconductor can transmit without energy loss is limited by the motion of the quantized magnetic flux penetrating into a superconductor. Introducing nanoscale holes into a superconducting film has been long pursued as a promising way to increase the...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-06, Vol.87 (22), Article 220501
Main Authors: Wang, Y. L., Latimer, M. L., Xiao, Z. L., Divan, R., Ocola, L. E., Crabtree, G. W., Kwok, W. K.
Format: Article
Language:English
Subjects:
Arrays
Density
Fluid flow
Magnetic fields
Nanostructure
Superconducting films
Superconductors
Vortices
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Summary:The maximum current (critical current) a type-II superconductor can transmit without energy loss is limited by the motion of the quantized magnetic flux penetrating into a superconductor. Introducing nanoscale holes into a superconducting film has been long pursued as a promising way to increase the critical current. So far the critical current enhancement was found to be mostly limited to low magnetic fields. Here we experimentally investigate the critical currents of superconducting films with a conformal array of nanoscale holes that have nonuniform density while preserving the local ordering. We find that the conformal array of nanoscale holes provides a more significant critical current enhancement at high magnetic fields. The better performance can be attributed to its arching effect that not only gives rise to the gradient in hole density for pinning vortices with a wide range of densities but also prevents vortex channeling occurring in samples with a regular lattice of holes.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.220501