Superconductivity and oxygen ordering in (Ca,Ba,La)Cu sub 3 O sub 7 minus. delta

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.11154· OSTI ID:6883689

Bjornholm, T; Schuller, I K; Early, E A; Maple, M B ^[1]; Wuyts, B; Vanacken, J; Bruynseraede, Y ^[2]

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1. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093 (USA)
2. Laboratorium voor Vaste Stof-Fysika en Magnetisme, Katholieke Universiteit Leuven, 3030 Leuven, (Belgium)

Magnetization measurements on polycrystalline samples with nominal composition Y{sub 1{minus}{ital x}}Ca{sub {ital x}}Ba{sub 2{minus}{ital x}}La{sub {ital x}}Cu{sub 3}O{sub 7{minus}{delta}} ({ital x}=0.0, 0.05, 0.10, 0.50, and 1.0) show that only samples with {ital x}=1.0 or 0.0 contain a single {ital superconducting} phase. Gas evolution experiments on (Ca,Ba,La)Cu{sub 3}O{sub 7{minus}{delta}} ({ital x}=1.0, {delta}{similar to}0.07) reveal the presence of an oxygen phase that is indistinguishable from the oxygen chain structure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({ital x}=0.0, {delta}{similar to}0.05); however, the total amount of evolved oxygen is very different between the two phases. These studies suggest that two phases coexist in (Ca,Ba,La)Cu{sub 3}O{sub 7{minus}{delta}}: a {ital superconducting} phase in which La{sup 3+} ions occupy the Y{sup 3+} sites, and a second {ital nonsuperconducting} phase where Ca{sup 2+} ions occupy the Y{sup 3+} sites.

• DOE Contract Number: FG03-86ER45230
• OSTI ID: 6883689
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BINDING ENERGY
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POLYCRYSTALS
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES