The Investigation of Critical Temperature Tc of Homophase Superconductors Bi1.7Pb0.3Sr2Ca(n– 1)CunOy (n = 3, 4, 5) and Current–Voltage Characteristics of InP Semiconductor–Bi/Pb Superconductor (2223, 2234, 2245) Sandwich Pairs

The electrophysical properties of semiconductor–superconductor sandwich pairs (InP–Bi/Pb 2223, 2234, 2245) are investigated, in which homophase superconductors based on bismuth cuprates with high reproducible critical temperatures of superconducting transition Tc = 107–180 K are used. The advantage of melt solar technology for obtaining superconducting materials is demonstrated. The microstructure and phase composition of strongly anisotropic superconductors with nominal composition Bi1.7Pb0.3Sr2Ca(n– 1)CunOy (n = 3, 4, 5) are researched. A technique of experimental determination of superconducting transition critical temperatures Tc in single-phase and homophase HTSC samples is presented. The current–voltage characteristics of InP–Bi/Pb pairs are investigated. The relationship between the electrical resistance of sandwich pairs and superconductor critical temperature Tc is established.