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High-Resolution Spectrochemical Analysis of Columnar Defects Formed in Bi2Sr2CaCu2Ox by Swift Heavy Ion Irradiation

Published online by Cambridge University Press:  01 February 2011

F. Kano ,
M. Terasawa ,
T. Mitamura ,
T. Kambara ,
Y. Sasaki  and
Y. Ikuhara
F. Kano
Affiliation:
Power & Industrial Systems Research & Development Center, Toshiba Co., 8 Shinsugita, Isogo-ku, Yokohama 235–8523, Japan
M. Terasawa
Affiliation:
Himeji Institute of Technology, Shosha 2167, Himeji 671–2201, Japan
T. Mitamura
Affiliation:
Himeji Institute of Technology, Shosha 2167, Himeji 671–2201, Japan
T. Kambara
Affiliation:
The Institute of Physical and Chemical Research, 2–1 Hirosawa, Wako 351–0106, Japan
Y. Sasaki
Affiliation:
Japan Fine Ceramics Center, 2–4–1 Mutsuno, Atsuta-ku, Nagoya 456–8587, Japan
Y. Ikuhara
Affiliation:
Engineering Research Institute, The University of Tokyo, Tokyo 113–8656, Japan
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Abstract

Single-crystal specimen of high-temperature superconductor Bi2Sr2CaCu2Ox was irradiated with 3.5 GeV Xe ions at room temperature up to 1.0 × 1011 ion/cm2. Significant enhancement of magnetization by the irradiation was confirmed. The irradiated specimens were studied by using a high-resolution transmission electron microscope with field emission electron gun (FE-TEM), and, also, with an energy dispersive x-ray analyzer (EDS). Columnar defects with diameter of about 6 nm were observed along the incident ion tracks. By nanoscale high-resolution x-ray spectrochemical analysis across the columnar defect, enrichment of Cu and depletion of Bi, Sr and Ca in the columnar defect center, and vice versa in the outskirts of the defect, was found for the first time. Oxygen depletion in the defect, and increased distribution outside of the defect were also found by electron energy loss spectroscopy. This experimental evidence suggests that the columnar defects are formed as a consequence of Coulomb explosion induced by the electronic excitation of the high-energy heavy ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 792: Symposium R – Radiation Effects and Ion Beam Processing of Materials , 2003 , R10.4
Copyright
Copyright © Materials Research Society 2004

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References

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