Local distortions and reduction in T/sub c/ in the ceramic superconductor La/sub 1. 8/Sr/sub 0. 2/Cu/sub 1-//sub x/Ag/sub x/O/sub 4/
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Substitution of Ag for Cu in the high-T/sub c/ ceramic superconductor La/sub 1.8/Sr/sub 0.2/CuO/sub 4/ has been found to reduce T/sub c/. The infrared absorption spectra of these superconducting systems show that the vibrational mode, which disappears at xapprox.0.15 for La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ appears at a reduced frequency in the Ag-substituted systems. It is argued that the local distortions around the Ag sites result in both the reduction of T/sub c/ as well as the appearance of the absorption peak at 630 cm/sup -1/.
- Research Organization:
- Advanced Centre for Research in Electronics, Indian Institute of Technology, Bombay 400076, India
- OSTI ID:
- 5619399
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 36:16
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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Mon Apr 13 00:00:00 EDT 1987
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·
OSTI ID:5619399
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Journal Article
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Thu Feb 01 00:00:00 EST 1990
· Journal of Solid State Chemistry; (USA)
·
OSTI ID:5619399
Evolution and the concomitant disappearance of high- Tc superconductivity with carrier concentration in the La sub 2 minus x Sr sub x CuO sub 4 minus. delta. system (0. 0 le x le 1. 2): Crossover from a Mott insulator to a band metal
Journal Article
·
Mon Jan 01 00:00:00 EST 1990
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:5619399
Related Subjects
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
INFRARED SPECTRA
OSCILLATION MODES
TRANSITION TEMPERATURE
LANTHANUM OXIDES
STRONTIUM OXIDES
ABSORPTION SPECTRA
CERAMICS
SILVER ADDITIONS
SUPERCONDUCTIVITY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SILVER ALLOYS
SPECTRA
STRONTIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
INFRARED SPECTRA
OSCILLATION MODES
TRANSITION TEMPERATURE
LANTHANUM OXIDES
STRONTIUM OXIDES
ABSORPTION SPECTRA
CERAMICS
SILVER ADDITIONS
SUPERCONDUCTIVITY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SILVER ALLOYS
SPECTRA
STRONTIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity