Superconductivity and metal-semiconductor transition in Sr-La-Cu-O system
The compounds with the nominal compositions of x = 0.5, 0.75, 1.0, 1.25, 1.5 of Sr/sub x/La/sub 5-//sub x/Cu/sub 5/O/sub 5(3-//sub y//sub )/ were prepared under the same conditions. Resistance of these samples were measured between 5K and 150 K. The results show that the superconductor-semiconductor-metal (superconductor) transition occurs when the composition of Sr increases from 0.5 to 1.5 in this system. By comparing with the BaPb/sub 1-//sub x/Bi/sub x/O/sub 3/ system the authors suggest that in this system the strong coupling of the electron-phonon interaction makes the lattice unstable, a charge-density-wave distortion is likely to happen, and could open a semiconductor gap at E/sub F/. The distortion would be suppressed when the composition of Sr varied; thus the transition from semiconductor to metal (superconductor) is observed.
- Research Organization:
- Department of Physics and Department of Applied Chemistry University of Science and Technology of China, Hefei, Anhui
- OSTI ID:
- 6359322
- Journal Information:
- Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 9:1; 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
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE