Enhanced current transport at grain boundaries in high-Tc superconductors

R. F. Klie (), J. P. Buban, M. Varela, A. Franceschetti, C. Jooss, Y. Zhu, N. D. Browning, S. T. Pantelides and S. J. Pennycook
Additional contact information
R. F. Klie: Brookhaven National Laboratory
J. P. Buban: The University of Tokyo
M. Varela: Oak Ridge National Laboratory
A. Franceschetti: Oak Ridge National Laboratory
C. Jooss: University of Göttingen
Y. Zhu: Brookhaven National Laboratory
N. D. Browning: University of California-Davis
S. T. Pantelides: Oak Ridge National Laboratory
S. J. Pennycook: Oak Ridge National Laboratory

Nature, 2005, vol. 435, issue 7041, 475-478

Abstract: Against the grain Soon after the discovery of high-temperature superconductors in 1986, it became clear that their polycrystalline nature has an unfortunate consequence: the superconducting properties are compromised by an orders of magnitude reduction in the critical current across these interfaces. Much work has gone into attempts to remove such boundaries. But a recent report suggested that doping can enhance the grain boundary critical current by an order of magnitude, providing a simple route towards practical use of YBa2Cu3O7-δ as a high-temperature superconductor. Klie et al. present an atomic-scale description of the mechanism behind the dramatic improvement of grain boundary properties. This work should lead to rational guidelines for the choice of suitable dopants.

Date: 2005
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DOI: 10.1038/nature03644

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