Synchrotron x-ray study of interstitial oxygen ordering in the superconducting phase of La2CuO4+δ
Creators
- 1. Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204 (United States)
- 2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
- 3. Texas Center for Superconductivity and Chemistry Department, University of Houston, Houston, Texas 77204 (United States)
Description
A synchrotron x-ray powder-diffraction study has been carried out on two samples with well-defined excess oxygen concentrations, δ=0.045 and 0.055. Evidence for one-dimensional interstitial oxygen ordering along the c-axis was observed from the appearance of a pair of superlattice satellite peaks at (0,1,2±Δ) in both samples. In La2CuO4.045, a∼5% oxygen-poor Bmab phase coexists with a stage-6 phase and with a small amount of the high-temperature-tetragonal (HTT) phase below the phase separation temperature (∼280 K). La2CuO4.055 shows a single stage-5 phase below 170 K, but with two unindexed peaks between (0,1,2±0.2) satellites which may well result from a further domain modulation. The critical temperature Tc is increased by 1.5 K by reducing the stage number from 6 to 5. copyright 1996 Materials Research Society
Additional details
Publishing Information
- Journal Title
- Journal of Materials Research
- Journal Volume
- 11
- Journal Issue
- 9
- Journal Page Range
- p. 2121-2124.
- ISSN
- 0884-2914
- CODEN
- JMREEE
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 28007234
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- COPPER OXIDES; HIGH-TC SUPERCONDUCTORS; INTERSTITIALS; LANTHANUM OXIDES; ORDER-DISORDER TRANSFORMATIONS; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; TRANSITION TEMPERATURE; X-RAY DIFFRACTION
- Descriptors DEC
- BREMSSTRAHLUNG; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIFFRACTION; ELECTROMAGNETIC RADIATION; LANTHANUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; POINT DEFECTS; RADIATIONS; RARE EARTH COMPOUNDS; SCATTERING; SUPERCONDUCTORS; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS