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Electron and hole doping in Nd-based cuprates with single-layer CuO/sub 2/ sheets: Role of doped Ce ions and 30-K superconductivity

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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We have attempted electron and hole doping in Nd-based cuprates with single-layer sheets of Cu-O squares and pyramids. It was found that partial substitution of Nd/sup 3+/ sites with Ce/sup 4+/ ions introduces mobile electrons into the Nd/sub 2/CuO/sub 4/ structure which shows two-dimensional (2D) sheets of Cu-O squares with no apical oxygens. With further Sr doping into Nd/sub 2-//sub x/Ce/sub x/CuO/sub 4/, the crystalline lattice undergoes a structural transformation into the new hole-conductive compound with 2D sheets of Cu-O pyramids, which is identical with the superconducting phase discovered recently by Akimitsu et al. The hole concentration in Nd/sub 2-//sub x//sub -//sub y/ Ce/sub x/Sr/sub y/CuO/sub 4-//sub delta/ can be increased by controlling the composition (x,y) of non-copper cations and filling oxygen vacancies (delta) as well, which give rise to superconductivity with T/sub c/ up to 30 K.
Research Organization:
Department of Physics, University of Tokyo, Tokyo 113, Japan
OSTI ID:
6114442
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Journal Issue: 13 Vol. 39:13; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METALS
CERIUM IONS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HOLES
IONS
LEPTONS
MATERIALS
METALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POINT DEFECTS
RARE EARTH COMPOUNDS
STRONTIUM
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
VACANCIES