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Low-Temperature Annealing Effect on Superconducting and Structural Properties of Ion-Irradiated Bi2Sr2CaCu2Ox Crystals

Samples of a highly textured 15 µm-thick Bi2Sr2CaCu2Ox polycrystalline layer have been irradiated with 180 MeV Cu11+ ions perpendicularly to the surface of the layer. Upon irradiation the intragrain Jc values of the superconducting material are increased but the critical temperature Tc values are depressed. To investigate the influence of stress induced on the crystal structure by irradiation defects, annealing of the irradiated samples at 573 K for 12 hours has been performed. After annealing, a partial recovery of the Tc and Jc values of unirradiated samples is obtained. Residual defects have been observed by high-resolution electron microscopy. It is shown that the amorphous material found in the columnar defects before annealing has partially recrystallized.