Abstract
Specimens of high- T c superconductors, YBCO and (YBCO) 1.96 Ag 0.04, were irradiated with γ-rays up to an integrated dose of 77 MR. Electrical resistance vs temperature and the X-ray diffraction patterns of the monolayers of the sample powders were obtained before and after the irradiations. The normal state resistance of the pure and Ag-doped YBCO specimens gradually increase as the γ-dose increases. The intensities of the X-ray diffraction peaks of the monolayers of the YBCO powders decrease with γ-irradiation without significant change of diffraction angles or peak widths. The zero resistance transition temperature of the Ag-doped YBCO specimens decreases by about 0.5% with γ-irradiation at 77 MR. These observations indicate that the high- T c superconductor YBCO is quite sensitive to γ-irradiation but drastic lattice expansion does not occur up to a γ-dose of 77 MR.
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