Abstract
The effects of oxygen annealing on the superconducting properties of high-quality single crystals of YBa 2Cu 3O 7−δ, that have been implanted with iron and cobalt ions, are reported. The implantation of ∼ 1 × 10 17 ions/cm 2 was carried out at 30kV using a metal-vapour vacuum arc ion source at room temperature. The crystals were then annealed in a flowing oxygen atmosphere for a total of 108 h at 550°C. The crystals were analysed for composition with Rutherford backscattering spectroscopy both at 2 and 3.06 MeV, their oxygen content through X-ray diffraction analysis, chemical bonding by X-ray photoelectron spectroscopy and superconductivity with AC susceptibility measurements. It was found that after oxygen annealing, the Fe implant was deleterious to the superconducting transition temperature, reducing the initial transition temperature by 13 K, whereas an increase of 5 K was observed for the Co implanted cyrstals. XPS also showed that both implants had formed an oxide after the anneal cycle.
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