Metal-semiconductor transition and superconductivity in the La-Ba-Cu-O system
The temperature dependence of resistance of specimens with the nominal composition Ba/sub x/La/sub 5-//sub x/Cu/sub 5/O/sub 5(3-//sub x//sub )/ (x = 0, 0.25, 0.5, 1.0, 1.25, 1.5; y>0) was measured. It was found that the binary oxide with x = 0 is a typical semiconductor, and the transition from semiconductor to semimetal, finally to metal (superconductor), occurs in this system as x increased. Also the critical temperature of the superconducting transition T/sub c/ is elevated monotonically by increasing the concentration of Ba. From the results of the energy bands calculated by Mattheiss and Freeman, a qualitative explanation is given according to the strong electron-phonon coupling theory. It is suggested that the addition of divalent barium in La/sub 2/CuO/sub 4/ suppresses the instability and stabilizes the superconducting phase.
- Research Organization:
- Department of Physics and Department of Applied Chemistry, University of Science and Technology of China, Hefei
- OSTI ID:
- 6743716
- Journal Information:
- Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 8:4; ISSN CHPHD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SEMICONDUCTOR MATERIALS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE