Synchrotron x-ray study of interstitial oxygen ordering in the superconducting phase of La{sub 2}CuO{sub 4+{delta}}
- Texas Center for Superconductivity and Physics Department, University of Houston, Houston, Texas 77204 (United States)
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Texas Center for Superconductivity and Chemistry Department, University of Houston, Houston, Texas 77204 (United States)
A synchrotron x-ray powder-diffraction study has been carried out on two samples with well-defined excess oxygen concentrations, {delta}=0.045 and 0.055. Evidence for one-dimensional interstitial oxygen ordering along the {ital c}-axis was observed from the appearance of a pair of superlattice satellite peaks at (0,1,2{plus_minus}{Delta}) in both samples. In La{sub 2}CuO{sub 4.045}, a{approximately}5{percent} oxygen-poor {ital 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 ({approximately}280 K). La{sub 2}CuO{sub 4.055} shows a single stage-5 phase below 170 K, but with two unindexed peaks between (0,1,2{plus_minus}0.2) satellites which may well result from a further domain modulation. The critical temperature {ital T}{sub {ital c}} is increased by 1.5 K by reducing the stage number from 6 to 5. {copyright} {ital 1996 Materials Research Society.}
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 383752
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 9 Vol. 11; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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