Oxygen concentration in intergranular layers and superconductivity of YBa2Cu3O<i>x</i> metaloxide ceramics

A diamagnetic study is carried out for YBa2Cu3Ox metal oxide ceramic subjected to deoxidation (followed by quenching) at different temperatures from 300 to 900 °C. A method of determining the oxygen concentration in granules and intergranular layers of the metaloxide is developed. It is found that oxygen-depleted N-interlayers are responsible for the degradation of superconducting properties of Josephson junctions of the S–I–N–S type formed during deoxidation. The possibility of decreasing the critical temperature of intergranular layers by varying the properties of insulating (I) interlayer is considered. The value of oxygen deficiency in intergranular layers of the ceramic relative to oxygen content in the bulk of granules is restored for the entire practically important temperature interval of metaloxide quenching. The physical principles of an analysis of the family of temperature dependences of diamagnetic response in bulk superconducting materials are considered.

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