X-ray-absorption studies of the high-T/sub c/ superconductors La/sub 1. 8/Sr/sub 0. 2/CuO/sub 4/ and La/sub 1. 8/Ba/sub 0. 2/CuO/sub 4/

Journal Article · Fri May 01 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.7203· OSTI ID:6615841

Boyce, J B; Bridges, F; Claeson, T; Geballe, T H; Chu, C W; Tarascon, J M

X-ray absorption studies of La/sub 1.8/Sr/sub 0.2/CuO/sub 4/ and La/sub 1.8/Ba/sub 0.2/CuO/sub 4/ indicate that no structural transition that alters the valence or the near-neighbor environment by >0.01 A occurs between 4 and 300 K. The doping with Sr and Ba primarily changes the Cu-O distance and width along the c axis. The larger width of the superconducting transition region observed in the Ba-doped material may result from its larger static disorder. Estimates of the Cu-O vibrational frequencies suggest that a phonon-coupling mechanism is just compatible with the observed T/sub c/.

• Research Organization: Xerox Palo Alto Research Center, Palo Alto, California 94304
• OSTI ID: 6615841
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

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
BOND LENGTHS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIMENSIONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LENGTH
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHONONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
X-RAY SPECTRA