Destruction and Recovery of Superconductivity in Bi-Pb-Sr-Ca-Cu-O Synthesized under High Pressure

概要

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The high-T_c superconductors (Bi, Pb)_2Sr_2Ca_2Cu_3O_x (2223phase) are hot-pressed from the superconducting powdermixtures under high pressure up to 5.4 GPa. Although the as-pressed sample synthesized under 40 MPa shows superconductivity, the as-pressed sample synthesized under 5.4 GPa does not. The as-pressed sample synthesized under 5.4 GPa consists of a mixture of an unknown phase and the 2223 phase having a longer c-lattice parameter (2223'). Microscopic structures of the pressed samples are examined by high-resolution transmission electron microscopy. In the as-pressed samples, curved c-planes, which are caused by high pressure, are obseved. In the 2223' of the as-pressed sample synthesized under 5.4 GPa, the c-planes are particularly heavily distorted. Recovery of the microstructures and superconductivity occurs through annealing.
社団法人応用物理学会の論文
1992-08-15