Superconductivity and crystal structure of LaBa/sub 2-x/Ca/sub x/Cu/sub 3/O/sub 7/
- Institute of Physics, Chinese Academy of Science, Beijing (CN)
- Beijing Lab. of Electron Microscopy, Chinese Academy of Science, Beijing (CN)
The samples with nominal composition LaBa/sub 2-chi/Ca/sub chi/Cu/sub 3/O/sub 7/ (chi = 0, 0.5, 1.0, 1.5, 2.0) have been prepared by solid state reactions and studied by x-ray diffraction method and transmission electron microscopy. The substitution and Ba by Ca results in the decrease of the cell volume, increase of the structural orthorhombic distortion and appearance of the c/3 translation domain. Of the five samples studied only those with chi = 0, 1.0, and 1.5 are superconductors. The chi = 0 sample shows onset temperature 90 {Kappa}, the zero resistance temperature 45 {Kappa} and a weak diamagnetic effect. The chi = 1.5 sample shows zero resistance at 72 {Kappa} and substantial diamagnetic effect. The relation between the crystal structure and superconductivity is discussed.
- OSTI ID:
- 5525147
- Journal Information:
- International Journal of Modern Physics B; (USA), Journal Name: International Journal of Modern Physics B; (USA) Vol. 1:7; ISSN 0217-9792; ISSN IJPBE
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MICROSCOPY
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY