A New Superconductor with T_c=47 K in the Bi-Sr-Cu-O System (Nominal Composition=Bi_4Sr_<8+x>Cu_<5-x>O_y)
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A new superconductive bismuth cuprate, with a nominal composition of Bi_4Sr_<8+x>Cu_<5-x>O_y, was discovered using resistivity and magnetization measurements. The onset transition temperatures of as-synthesized and He-annealed samples are 42 K and 47 K, respectively. This superconductive phase is very unstable at the synthesis temperature, and thus, changes into Bi_4Sr_8Cu_5O_<19+α> and Bi_2Sr_3Cu_2O_y with prolonged calcination. Because of this instability, a single phase cannot be obtained. X-ray diffraction measurements indicate the existence of a new phase with a large-value peak of d=19.8Å.
- 社団法人応用物理学会の論文
- 1992-04-01
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