X-ray-absorption near-edge-structure study of La/sub 2-//sub x/(Ba,Sr)/sub x/CuO/sub 4-//sub y/ superconductors
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Superconductors with the composition La/sub 2-//sub x/(Ba,Sr)/sub x/CuO/sub 4-//sub y/ and x = 0.0 to 0.3 have been studied through measurements of x-ray-absorption near-edge-structure at the Cu K and La L edges. Contrary to recent band-structure calculations, we find that the Cu 3d electrons are localized with the copper ions having an integral 3d/sup 9/ configuration (2 + valence) independent of dopant concentration. Variation in the area of the ''white lines'' at the La L/sub 2,3/ edges with doping indicates that reduction of the valence charge results in an increase in unoccupied states (probably consisting of holes in the O 2p band) having d symmetry relative to the La site. These O 2p holes also appear to have d symmetry with respect to the Cu sites.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6252578
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:10; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
X-ray absorption studies of La/sub 2-//sub x/(Ba,Sr)/sub x/CuO/sub 4/ superconductors
Determination of valence of Cu in superconducting La/sub 2-//sub x/(Sr,Ba)/sub x/CuO/sub 4/
Studies of Y-Ba-Cu-O single crystals by x-ray absorption spectroscopy
Journal Article
·
Fri May 01 00:00:00 EDT 1987
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:6089629
Determination of valence of Cu in superconducting La/sub 2-//sub x/(Sr,Ba)/sub x/CuO/sub 4/
Journal Article
·
Fri May 01 00:00:00 EDT 1987
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:6655987
Studies of Y-Ba-Cu-O single crystals by x-ray absorption spectroscopy
Conference
·
Fri Jan 31 23:00:00 EST 1992
·
OSTI ID:10153990
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
K SHELL
L SHELL
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTRA
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
K SHELL
L SHELL
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTRA