High-temperature superconductivity in tetragonal perovskite structures: Is oxygen-vacancy order important

Journal Article · Mon Apr 04 00:00:00 EDT 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.60.1446· OSTI ID:5311448

Xiao, G; Cieplak, M Z; Gavrin, A; Streitz, F H; Bakhshai, A; Chien, C L

We used Zn and Ga, two unique dopants having definite valence states and filled 3d levels, to substitute preferentially on the Cu(2) and Cu(1) sites in the YBa/sub 2/Cu/sub 3/O/sub 7/ superconductor. Small doping of Ga induces an orthorhombic-to-tetragonal structural transition, but the values of T/sub c/ are as high as 81 K in the tetragonal phase. Our results indicate that the oxygen-vacancy order, or the linear-chain structure, is not essential. We also find that the Cu(2) sites are much more crucial than the Cu(1) sites in sustaining the high T/sub c/.

• Research Organization: Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
• OSTI ID: 5311448
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 60:14
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CRYSTAL DOPING
SUPERCONDUCTIVITY
COPPER OXIDES
YTTRIUM COMPOUNDS
CRYSTAL-PHASE TRANSFORMATIONS
D STATES
GALLIUM ADDITIONS
LOW TEMPERATURE
PEROVSKITES
TRANSITION TEMPERATURE
VACANCIES
ZINC ADDITIONS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
GALLIUM ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POINT DEFECTS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZINC ALLOYS
360204* - Ceramics
Cermets
& Refractories- Physical Properties