Formation of High-T_c 110 K Superconducting Phase at the PbO/Bi_2Sr_2Ca_4Cu_6O_y Interfaces

概要

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Reaction and intermixing at the PbO/Bi_2Sr_2Ca_4Cu_6O_y interfaces led to the formation of a high-T_c superconducting Phase of Bi-Sr-Ca-Cu-O with a superconducting onset at about 110 K. Samples have been prepared by a solid state reaction in air. Samples, heat treated at about 845℃ for 50-150 h, showed zero resistivity above 100 K. Both the ac susceptibility measurements and the X-ray powder diffraction revealed the high-T_c phase. A sample without the interfaces did not become superconducting above 77 K after the same heat treatment. Although the superconducting properties of the samples were quite sensitive to the heating conditions, the growth of the high-T_c phase was clearly promoted by the presence of the interfaces.
社団法人応用物理学会の論文
1989-01-20