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Science 9 September 1994:
Vol. 265. no. 5178, pp. 1552 - 1555
DOI: 10.1126/science.265.5178.1552
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Articles

Simultaneous Observation of Columnar Defects and Magnetic Flux Lines in High-Temperature Bi2Sr2CaCu2O8 Superconductors

Hongjie Dai 1, Seokwon Yoon 1, Jie Liu 1, Ramesh C. Budhani 2, and Charles M. Lieber 1

1 Division of Applied Sciences and Department of Chemistry, Harvard University, Cambridge, MA 02138, USA.
2 Department of Physics, Indian Institute of Technology, Kanpur 208016, India

Columnar defects generated by heavy-ion irradiation are promising structures for pinning magnetic flux lines and enhancing critical currents in superconductors with high transition temperatures. An approach that combines chemical etching and magnetic decoration was used to highlight simultaneously the distributions of columnar defects and magnetic flux lines in Bi2Sr2CaCu2O8 superconductors. Analyses of images of the columnar defects and flux-line positions provide insight into flux-line pinning by elucidating (i) the occupancy of columnar defects by flux lines, (ii) the nature of topological defects in the flux-line lattice, and (iii) the translational and orientational order in this lattice.

Submitted on May 20, 1994
Accepted on July 18, 1994


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Elastic Properties of Flux-Line Arrays in High Transition Temperature Superconductors Probed by Two-Sided Decoration.
S. Yoon, Z. Yao, H. Dai, and C. M. Lieber (1995)
Science 270, 270-273
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