Hole filling and hole creation in the superconducting compounds Bi sub 2 Sr sub 2 minus x R x CuO sub 6+ y ( R =La, Pr, Nd, and Sm)

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.12994· OSTI ID:5490760

Sales, B C; Chakoumakos, B C ^[1]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6056 (USA)

The superconducting properties, hole content, and lattice constants of several rare-earth-doped compounds Bi{sub 2}Sr{sub 2{minus}{ital x}R{ital x}}CuO{sub 6+{ital y}} have been investigated as a function of rare-earth doping and oxygen content. The maximum superconducting transition temperature, {ital T}{sub {ital c}}, obtained for each of the rare-earth dopants was 23 K (La), 25 K (Pr), 21 K (Nd), and 12 K (Sm). The {ital T}{sub {ital c}}'s of these compounds exhibited a parabolic dependence on the La and Pr concentration (0{lt}{ital x}{lt}1), with the maximum {ital T}{sub {ital c}} occurring for {ital x}=0.4 for samples with low oxygen content. For La- and Pr-doped samples treated in pure oxygen, the position of the maximum shifted to {ital x}=0.6 and 0.5, respectively, with a concurrent reduction in the maximum value for {ital T}{sub {ital c}} (17 K for La and 18 K for Pr). For {ital x}{gt}0.2, the samples were single phase and exhibited unusually sharp superconducting transitions (width of ac-susceptibility transition less than 2 K). The high quality of the samples allowed a precise study of the variation of the orthorhombic cell parameters with the rare-earth and oxygen content.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5490760
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:16; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
HOLES
COPPER OXIDES
LANTHANUM OXIDES
NEODYMIUM OXIDES
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
CARRIER DENSITY
CORRELATIONS
DOPED MATERIALS
HIGH-TC SUPERCONDUCTORS
IMPURITIES
LATTICE PARAMETERS
QUANTITY RATIO
STOICHIOMETRY
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
LANTHANUM COMPOUNDS
MATERIALS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties