Abstract
Effects of 1 MeV Ar+ ion irradiation on thin films of high-Tc oxide superconductor Ba2YCu3O7-x (BYCO) were investigated in the fluence range between 1.7×1010 ions/cm2 and 9.9×1013 ions/cm2. Increase of transport critical current density (Jc) by irradiation was observed with a fluence below 1.3×1011 ions/cm2, while the critical temperature (Tc) was unchanged in this fluence region. With a fluence above 3.4×1011 ions/cm2, both Tc and Jc decreased with increasing fluence. Regarding the change of the crystal structure, expansion of the c-axis lattice constant and an increase of full width at half maximum(FWHM) value of the peak in X-ray diffraction were observed above a fluence of 1.0×1013 ions/cm2. These results suggest that the radiation induced defects act as pinning centers in the low fluence region, and they cause the destruction of the crystal structure in the high fluence region.
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