Roles of oxygen defects in copper-oxide superconductors
Conference
·
OSTI ID:10162016
Oxygen vacancy and interstitial defects can have a profound effect on the superconducting compounds. Recent work on compounds such as La{sub 2}CuO{sub 4+x} new insight into the role of interstitial oxygen defects as a doping mechanism. Studies of (La,Sr,Ca){sub 3}Cu{sub 2}O{sub 6+x} with various metal compositions and metal-site ordering show that interstitial oxygen defects that form between the CuO{sub 2} layers in this structure systematically lower {Tc} and eventually destroy superconductivity. However, oxygen vacancies in the CuO{sub 2} planes have surprisingly little effect at concentrations below 3%. The infinite-layer compounds, ACuO{sub 2} where A=La, Sr, Ca, Nd, etc., in solid-solution combinations, offer a very environment for the formation of interstitial oxygen defects between the CuO{sub 2} planes. However, neutron diffraction experiments on Sr{sub 0.9}La{sub 0.1}CuO{sub 2} ({Tc}=42K) have not found any interstitial oxygen.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10162016
- Report Number(s):
- ANL/MSD/CP--79578; CONF-930682--1; ON: DE93014875; CNN: Grant DMR-91-20000
- Country of Publication:
- United States
- Language:
- English
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Mon Oct 01 00:00:00 EDT 1990
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