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Journal of Electron Microscopy 51:S235-S238 (2002)
© 2002 Oxford University Press

Full-length paper

Defect structure of high-Tc superconductor by high-energy heavy ion irradiation

Masato Sasase, Satoru Okayasu, Hiroki Kurata and Kiichi Hojou

Department of Materials Science, Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan

To whom correspondence should be addressed. E-mail: sasase{at}analchem.tokai.jaeri.go.jp

The observation of columnar defects for high-energy heavy ions produced in the high-Tc superconductor was made with an electron microscope in order to clarify the governing factors and mechanisms for columnar defect formation. Bi2Sr2CaCu2O8 (Bi-2212) was irradiated with Au+ ions (60~300 MeV) with a fluence of 6.3 x 1010 ions cm-2 at room temperature, using a Tandem accelerator. We observed the columnar defects with diameter from 8.4 to 16 nm. The present experiments show that the size of the columnar defects depend on the irradiated ion energy. The correlations between the deposited energy (Se) and the effective energy for defect formation (w) were estimated. The results were interpreted in terms of a time-dependent line source model of thermal spike. It was found that one-third of the deposited energy (Se) contributed to the columnar defect formation.

Keywords     high-energy heavy ion, columnar defects, thermal spike, high-Tc superconductor, electronic excitation, time dependent line source (TDLS) model


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