Superconductivity of La sub 2-x Nd sub x CuO sub 4+z prepared under high oxygen pressure: Suppression of the phase separation seen in La sub 2 CuO sub 4+z
- Mie Univ. Tsu, Mieken (Japan)
- Kyoto Univ. Uji (Japan)
La{sub 2-x}Nd{sub x}CuO{sub 4+z} was prepared under oxygen pressures ranging between 0.2 bar and 60 kbar. The oxygen content increased slightly as the Nd content increased; z {approx equal} 0.09 for x=0.4 under 60 kbar of oxygen. The Nd substitution and the introduction of excess oxygen ion counteract each other from the viewpoint of structure chemistry. For La{sub 2}CuO{sub 4+z} the superconducting transition temperature, T{sub c}, was almost independent of z at around 40 K, while the T{sub c} of the Nd-doped samples showed a strong dependence. The superconductive volume fraction was considerably increased by the Nd doping. The phase separation into the nearly stoichiometric (z{approx equal}0) semiconductive phase and an oxygen-rich superconductive phase as seen in La{sub 2}CuO{sub 4+z} may be suppressed by the Nd-for-La substitution.
- OSTI ID:
- 7110641
- Journal Information:
- Journal of Solid State Chemistry; (United States), Vol. 92:1; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER OXIDES
CHEMICAL PREPARATION
ELECTRIC CONDUCTIVITY
MAGNETIC SUSCEPTIBILITY
LANTHANUM OXIDES
NEODYMIUM OXIDES
CHEMICAL COMPOSITION
CRITICAL TEMPERATURE
CRYSTAL DOPING
EXPERIMENTAL DATA
LOW PRESSURE
MEDIUM PRESSURE
OXYGEN
PHASE STUDIES
PRESSURE EFFECTS
SEMICONDUCTOR MATERIALS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
ELEMENTS
INFORMATION
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MATERIALS
NEODYMIUM COMPOUNDS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SYNTHESIS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies