Oxygen isotope effects in yttrium-barium-copper oxides
Superonducting yttrium-barium-copper oxide samples have been highly enriched with /sup 18/O (up to 91--96 at. %) by methods that ensure homogeneous distribution of the oxygen isotope throughout all lattice oxygen sites. The preparative routes used include the pyrolysis of nitrates, gas-phase exchange (which does not ensure homogeneous exchange of all sites), oxidation of amorphous YBa/sub 2/Cu/sub 3/ alloy, and hydrolysis oxidation of Y-BaF/sub 2/-Cu thin films. The T/sub c/'s of /sup 18/O-enriched samples vary with some methods of preparation. Some /sup 17/O-enriched samples were also prepared for comparison. The composition and structure of materials derived from the various preparative routes were characteized, and their magnetic and electrical properties were measured.
- Research Organization:
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
- OSTI ID:
- 6419218
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:7; ISSN PRBMD
- 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
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-EVEN NUCLEI
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
MAGNETIC PROPERTIES
NUCLEI
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHYSICAL PROPERTIES
SAMPLE PREPARATION
STABLE ISOTOPES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES