Abstract
Cuprate oxycarbonate Sr2CuO2(CO3) thin films have been obtained from the "parent" infinite-layer compound thin films by thermal annealing at 700°C in air. The precursor infinite-layer compound thin films were grown by metal-organic chemical vapor deposition. The effect of oxygen annealing on electronic properties of these films and the attempt of converting the Ca substituted Sr0.9Ca0.1CuO2 thin film by annealing in ordinary air are reported. The as-converted Sr2CuO2(CO3) films are p-type semiconductors with a hole density of 1019 cm-3 and a room temperature resistivity of 0.1 Ω cm. Annealing in 1.0 atm oxygen at temperatures of 550-700°C decreases the room temperature resistivity to 0.02-0.03 Ω cm and increases the hole concentration to 1020-1021 cm-3. Metal-like behavior is observed in the transport properties, and a superconducting transition onset is observed at 30 K, with zero-resistivity obtained at 9 K.
Original language | English (US) |
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Pages (from-to) | 242-248 |
Number of pages | 7 |
Journal | Physica C: Superconductivity and its applications |
Volume | 291 |
Issue number | 3-4 |
DOIs | |
State | Published - Dec 1 1997 |
Funding
The authors would like to thank Dr. R. Feenstra in Oak Ridge National Laboratory for helpful discussions regarding this work. This research was supported by the National Science Foundation (grant DMR 91-20000) through the Science and Technology Center for Superconductivity at both Northwestern University and the University of Illinois at Urbana-Champaign. Support for the characterization facilities was provided by the National Science Foundation through the Materials Research Center of Northwestern University (grant DMR 9120521).
Keywords
- Chemical vapor deposition
- Infinite-layer compound
- Oxycarbonate superconducting film
- Oxygen annealing
- Transport properties
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering