Evidence of in-plane superstructure formation in phase-separated and staged single crystal La{sub {bold 2}}CuO{sub {bold 4+{delta}}}
- Physics Department and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-5506 (United States)
In single crystal La{sub 2}CuO{sub 4+{delta}}, {delta}{approximately}0.015, {ital c}-axis interstitial oxygen ordering (staging) in the oxygen-rich phase of the phase-separated sample was observed through satellite peaks in the neutron scattering at (0,1,4{plus_minus}{approximately}0.16) which first appear at 250 K. A superconducting {ital T}{sub {ital c}}{approx_equal}31 K was achieved by prolonged annealing at 200 K of a staged crystal whose {ital T}{sub {ital c}} was subsequently enhanced by {approximately}1.5 K during a 7 h cooling from 215 to 190 K. This annealing below 215 K initiates a splitting of the staging satellites along the {ital a}{sup *} direction which signifies a one-dimensional modulation of the in-plane order. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284515
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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