Structure of Au24+-ion-irradiation-induced defects in high-Tcsuperconductors
作者:
Yimei Zhu,
R.C. Budhani,
Z.X. Cai,
D.O. Welch,
M. Suenaga,
R. Yoshizaki,
H. Ikeda,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1993)
卷期:
Volume 67,
issue 2
页码: 125-130
ISSN:0950-0839
年代: 1993
DOI:10.1080/09500839308243862
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Irradiation of YBa2Cu3O7-δand Bi2Sr2Ca3Cu3Oxsuperconductors with 300 MeV gold ions leads to the formation of columnar defects along the ion trajectory. These columns consist of amorphized material within the envelope of a displacement-strain field which propagates into the crystal lattice. The morphology of the defects shows a characteristic shape and size depending on the direction of the incident ion with respect to the crystallographic planes of the superconductors. The defects have a circular symmetry for the ion beam directed perpendicular to thea-bplane, while they are larger and elliptical when the beam is parallel to thea-corb-cplanes. A simple model based on the idea of ion-induced localized melting and anisotropic thermal conductivity of these materials helps us to understand the size and shape of these defects.
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