Article abstract
Nature Materials 8, 398 - 404 (2009)
Published online: 6 April 2009 | doi:10.1038/nmat2408
Subject Categories: Electronic materials | Superconductors
Synergetic combination of different types of defect to optimize pinning landscape using BaZrO3-doped YBa2Cu3O7
B. Maiorov1, S. A. Baily1,2, H. Zhou1,2, O. Ugurlu1,3, J. A. Kennison1, P. C. Dowden1, T. G. Holesinger1, S. R. Foltyn1 & L. Civale1
Abstract
Retaining a dissipation-free state while carrying large electrical currents is a challenge that needs to be solved to enable commercial applications of high-temperature superconductivity. Here, we show that the controlled combination of two effective pinning centres (randomly distributed nanoparticles and self-assembled columnar defects) is possible and effective. By simply changing the temperature or growth rate during pulsed-laser deposition of BaZrO3-doped YBa2Cu3O7 films, we can vary the ratio of these defects, tuning the field and angular critical-current (Ic) performance to maximize Ic. We show that the defects' microstructure is governed by the growth kinetics and that the best results are obtained with a mixture of splayed columnar defects and random nanoparticles. The very high Ic arises from a complex vortex pinning landscape where columnar defects provide large pinning energy, while splay and nanoparticles inhibit flux creep. This knowledge is used to produce thick films with remarkable Ic(H) and nearly isotropic angle dependence.
- Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- These authors contributed equally to this work
- Present address: Characterization Facility, University of Minnesota, Minneapolis, Minnesota 55455, USA
Correspondence to: B. Maiorov1 e-mail: maiorov@lanl.gov
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