[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

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.1492· OSTI ID:6739110

Chen, X H; Chen, H; Zhang, H; Wong, C Y; Chen, Z J; Cao, L Z ^[1]; Zhou, G E; Zhang, Y H ^[2]

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1. Department of Physics, University of Science Technology of China, Hefei, Anhui 230026 (China)
2. 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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