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Preparation and Raman analysis of single-phase Y/sub 1/minus//ital x//Pr/sub /ital x//Ba/sub 2/Cu/sub 3/O/sub 7/minus/delta/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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A series Y/sub 1/minus//ital x//Pr/sub /ital x//Ba/sub 2/Cu/sub 3/O/sub 7/minus/delta/ materials with 0less than or equal to/ital x/less than or equal to1 have been prepared that do not show phase separation and have sharp superconducting transitions for /ital x/less than or equal to0.45. These samples have been characterized by x-ray diffraction, resistivity, field-cooled magnetization, and thermogravimetric analysis. Raman spectra have been obtained for the entire series, including the nonsuperconducting regions. The O(4) stretching mode at /similar to/500 cm/sup /minus/1/ is seen to harden by 15 cm/sup /minus/1/, while the Cu(2)-O(2,3) out-of-phase bending mode at /similar to/340 cm/sup /minus/1/ is seen to soften by 40 cm/sup /minus/1/ on going from YBa/sub 2/Cu/sub 3/O/sub 7/ to PrBa/sub 2/Cu/sub 3/O/sub 7/. These changes fall on a universal curve for the Raman shifts of all the compounds /ital R/Ba/sub 2/Cu/sub 3/O/sub 7/ (/ital R/=rare earth) as a function of the radii of the rare-earth ions. No abrupt changes in the Raman shifts are observed at /ital x/=0.5, where the superconductivity is destroyed.
Research Organization:
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550(US); Sandia National Laboratories, P.O. Box 969, Livermore, California 94550; Department of Physics, University of California-Davis, Davis, California 95616
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
6000214
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:16; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
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
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHASE STUDIES
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SCATTERING
SPECTRA
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES