In high-quality c-axis-oriented MgB2 thin films, we observed high critical current densities (Jc) of 16 MA/cm^2 at 15 K under self fields comparable to those of cuprate high-temperature superconductors. The extrapolated value of Jc at 5 K was estimated to be 40 MA/cm^2. For a magnetic field of 5 T, a Jc of 0.1 MA/cm^2 was detected at 15 K, suggesting that this compound would be a very promising candidate for practical applications at high temperature and lower power consumption. The vortex-glass phase is considered to be a possible explanation for the observed high current-carrying capability.
@article{arxiv.cond-mat/0105363,
title = {High current-carrying capability in c-axis-oriented superconducting MgB2 thin films},
author = {Hyeong-Jin Kim and W. N. Kang and Eun-Mi Choi and Mun-Seog Kim and Kijoon H. P. Kim and Sung-Ik Lee},
journal= {arXiv preprint arXiv:cond-mat/0105363},
year = {2009}
}
Comments
3 pages and 4 figures, to be published in Physical Review Letters