Optical studies of high-Tc oxide superconductors

Abstract Oxygen deficiency effects on the superconductivity of YBa2Cu3O7-δ are investigated by the electrical resistivity and the infrared reflection spectroscopy. On increasing the quenching temperature the sample changes to a semiconductor from a metal. The superconducting gap of the slowly cooled sample is anisotropic and the minimum gap is 2Δ/kBTc∼1.6. The anisotropy of the sample quenched from 600°C is very small in the proximity-coupled superconducting region and the 2Δ/kBTc∼1.

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