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

Journal Article · Thu Dec 31 23:00:00 EST 1987 · 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]

---

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

Related Subjects

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