High-Resolution Electron Microscopy Observation of Defects in 180 MeV Cu11+ Ion-Irradiated Bi2Sr2CaCu2O8 Crystals

Abstract
Irradiation with 180 MeV Cu11+ ions, perpendicular to the surface of a 15-µm-thick Bi2Sr2CaCu2O8 layer, enhances the irreversibility fields and increases the values of the intragrain J c of the superconducting material. Irradiation-induced structural damages have been observed by high-resolution electron microscopy. Crystal defects consist of long continuous cylindrical columns of highly damaged material that traverse the layer. Columns are parallel to the direction of the ion beam. Diameter values lie between 2 and 8 nm.

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