18MeV Fe^<8+>イオン照射によるBi_2Sr_2CaCu_2O_x超伝導体の特性と微構造の変化

概要

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Bi_2Sr_2CaCu_2O_x single crystals were irradiated with 18MeV Fe^<8+> ion at room temperature. Superconductive property and microstructure of the samples after the irradiation were investigated by magnetization hysteresis (ΔM) and transmission electron microscopy (TEM).ΔM was enhanced by increasing ion dose up to 1×10^<12>ions/cm^2, but decreased at the density of 1×10^<13>ions/cm^2. The ion irradiation produced ellipse-like amorphous defects with the size of several nm, which may behave as flux pinning centers inside the crystals. The defects were formed in the band region of 0.5μm at the depth of about 4.5μm from the surface. The number of defects were equal to several times of applied ion dose. The optimum dose for improving supercon-ductivity should be dominated by the defect size and spacing of defects to avoid overlapping among the defects.
社団法人日本セラミックス協会の論文
1995-02-01