Modulation-free bismuth-lead cuprate superconductors: BiPbSr sub 1+ x L1 minus x CuO sub 6 and BiPbSr sub 2 Y sub 1 minus x Ca sub x Cu sub 2 O sub 8

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.8686· OSTI ID:5689812

Manivannan, V; Gopalakrishnan, J; Rao, C N.R. ^[1]

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1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560 012, India (IN)

Modulation-free BiPbSr{ital L}CuO{sub 6} ({ital L}=La, Pr, Nd) and BiPbSr{sub 2}YCu{sub 2}O{sub 8}, which are isotypic with the {ital n}=1 and 2 members of the Bi{sub 2}Sr{sub 2}Ca{sub {ital n}{minus}1}Cu{sub {ital n}}O{sub 2{ital n}+4} family, have been prepared and characterized. These parent compounds are nonsuperconducting, but when doped with holes by substitution chemistry give modulation-free superconducting cuprates of the general formulas BiPbSr{sub 1+{ital x}L1{minus}{ital x}}CuO{sub 6} and BiPbSr{sub 2}Y{sub 1{minus}{ital x}}Ca{sub {ital x}}Cu{sub 2}O{sub 8}, exhibiting maximum {ital T}{sub {ital c}}'s of 24 and 85 K, respectively. Significantly, the hole concentration at the maximum {ital T}{sub {ital c}} is 0.12 in the cuprate family with a single Cu-O layer and 0.22 in that with two Cu-O layers.

• OSTI ID: 5689812
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:10; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
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HOLES
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MODULATION
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OXIDES
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PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES