Superconductive photoconductive-substance of the La-Cu-O system and a method for producing the same

Abstract

The disclosed substance has a general chemical formula of La.sub.2 -Cu.sub.1 -O.sub.z, z being 3.84 to 4.00. The disclosed substance shows, at a temperature below 20.degree. K., superconductivity, either potential or real, and the substance also shows, at a temperature below 30.degree. K., superconductive photoconductivity in response to incident exciting light in a wavelength range of 420 to 640 nm. The substance is produced by heating a mixture of starting material therefor at 900.degree.-1,050.degree. C. for 5-10 hours to cause solid state reaction, cooling gradually, shaping under pressure, re-sintering at 700.degree.-1,200.degree. C., and cooling either quickly at a rate of 2,000.degree.-900.degree. C./sec or slowly at a rate of 150.degree.-200.degree. C./hour.

Dependencies are inferred from the claim text.