Study on the superconductivity of Ba/sub 2/(Y/sub 1-chi/La/sub chi/)Cu/sub 3/O/sub 7-y/

Journal Article · Fri Jan 01 00:00:00 EST 1988 · Modern Physics Letters B; (USA)

DOI:https://doi.org/10.1142/S0217984988000254· OSTI ID:5658155

Dong, C; Liang, J K; Cui, C G; Li, S L; Ni, Y M; Jia, S L; Zhao, Z X ^[1]

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1. Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing (CN)

A series of samples with the nominal composition Ba/sub 2/(Ba/sub 1-chi/La/sub chi/)Cu/sub 3/O/sub 7-y/, (0{le}chi{le}1) was synthesized by solid state reaction. An X-ray diffraction study showed that a continuous solid solution exists between Ba/sub 2/YCu/sub 3/O/sub 7-y/ and Ba/sub 2/LaCu/sub 3/O/sub 7-y/ and there is a composition induced order-disorder transition from an orthorhombic to a tetragonal structure when chi value is near 0.9. All the samples with orthorhombic crystal structure are superconductors with T/sub c/ onset above 90{Kappa}. The transition midpoint temperature decreases smoothly when La content increases. The samples with chi{ge}0.9 have a tetragonal structure and show semiconductor behavior with an exception of the chi=1.0 sample which is a superconductor. Based on the authors previous and present studies, the authors concluded that the low dimensional character of the crystal structure and the mixed-valence state of copper or oxygen are necessary conditions for high-T/sub c/ superconductivity in copper-containing oxides.

• OSTI ID: 5658155
• Journal Information: Modern Physics Letters B; (USA), Vol. 2:3; ISSN 0217-9849
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM OXIDES
SUPERCONDUCTIVITY
COPPER OXIDES
LANTHANUM OXIDES
SUPERCONDUCTORS
CRYSTAL STRUCTURE
YTTRIUM OXIDES
COPPER
ORDER-DISORDER TRANSFORMATIONS
ORTHORHOMBIC LATTICES
OXYGEN
SOLID SOLUTIONS
TETRAGONAL LATTICES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL LATTICES
DIFFRACTION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
LANTHANUM COMPOUNDS
METALS
MIXTURES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
400101 - Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures