[ital T][sup *] phase (Bi[sub 0. 5]Sr[sub 1. 5])(Y[sub 2[minus][ital x]]Ce[sub [ital x]])Cu[sub 2]O[sub 8[minus][delta]] superconductors: The effect of ionic radius on structure
- Department of Physics, University of Science Technology of China, Hefei, Anhui 230026 (China)
- Structure Research Laboratory, Academia Sinica, University of Science (China)
We have successfully synthesized the superconductor (Sr[sub 1.5]Bi[sub 0.5])(Y[sub 2[minus][ital x]]Ce[sub [ital x]])Cu[sub 2]O[sub 8[minus][delta]], the crystal structure of which is similar to that of [ital T][sup *]-phase (Nd,Sr,Ce)[sub 2]CuO[sub 4]. This structure is also believed to be without the double Bi-O layer as in Bi[sub 2]Sr[sub 2]([ital L],Ce)[sub 2]Cu[sub 2]O[sub [ital y]], and the coupling between layers in (Sr,Bi)[sub 2](Y,Ce)[sub 2]Cu[sub 2]O[sub 8[minus][delta]] is stronger than in Bi[sub 2]Sr[sub 2]([ital L],Ce)[sub 2]Cu[sub 2]O[sub [ital y]]. The transition temperature is actually increased by about 8 K. This result seems to be different from that in Tl-based superconductors. It is also found that the ionic radius of the [ital A] site in the Cu perovskite unit [ital A]CuO[sub 3[minus][delta]] is critical to the formation of the [ital T], [ital T][prime], [ital T][sup *] phases.
- OSTI ID:
- 6739110
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:2; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CERIUM COMPOUNDS
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CUPRATES
HIGH-TC SUPERCONDUCTORS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
SYNTHESIS
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YTTRIUM COMPOUNDS