Superconducting superoxygenated cuprates: Search for phase separation in La sub 1. 84 Sr sub 0. 16 CuO sub 4+. delta. (US)
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Sandia National Laboratories, Albuquerque, New Mexico (USA)
- Los Alamos National Laboratory, Los Alamos, New Mexico (USA)
We have studied high-pressure (2.3 kbar), high-temperature (575 {degree}C), oxygen-annealed ceramic La{sub 1.84}Sr{sub 0.16}CuO{sub 4+{delta}} by high-resolution neutron powder diffraction to determine its low-temperature structural properties in comparison to similarly oxygenated La{sub 2}CuO{sub 4+{delta}}. Unlike La{sub 2}CuO{sub 4+{delta}}, the Sr-containing superconductor shows no low-temperature phase separation. Further, the interstitial oxygen appears to be located at (1/4,1/4,{ital z}) with {ital z}=0.163(5) and to have a value of {delta} consistent with La{sub 1.84}Sr{sub 0.16}CuO{sub 4.019}. Such a site is significantly displaced away from the interstitial location, (1/4,1/4,{ital z}), with {ital z}=0.25, observed in La{sub 2}CuO{sub 4+{delta}} and La{sub 2}NiO{sub 4+{delta}}. The environment of such an interstitial site is suggestive of a smaller, neutral oxygen rather than a charged species.
- DOE Contract Number:
- W-7405-ENG-36; AC04-76DP00789
- OSTI ID:
- 5293602
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:14; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
ELEMENTS
INTERSTITIALS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MEDIUM TEMPERATURE
NEUTRON DIFFRACTION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
POINT DEFECTS
POWDERS
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
STRUCTURAL MODELS
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
VERY LOW TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
ELEMENTS
INTERSTITIALS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MEDIUM TEMPERATURE
NEUTRON DIFFRACTION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
POINT DEFECTS
POWDERS
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
STRUCTURAL MODELS
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
VERY LOW TEMPERATURE