Abstract
Epitaxial cuprate oxycarbonate Sr2CuO2(CO3) thin films have been prepared by metal-organic chemical vapor deposition. The effects of deposition conditions on phase stability have been determined. X-ray diffraction, transmission electron microscopy, Rutherford backscattering spectroscopy, inductively coupled plasma atomic emission spectroscopy, and Fourier transform infrared spectroscopy were used to characterize the oxycarbonate thin films. The resistivity of the undoped Sr2CuO2(CO3) thin films decreases from ∼0.2 Ω cm to ∼0.01 Ω cm upon post annealing in oxygen, but semiconducting behavior is observed. Doping has been achieved through partial substitution of BO3-3 for CO2-3. Superconductivity with a Tc (onset) of 34 K and a Tc (zero) of 20 K has been obtained.
Original language | English (US) |
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Pages (from-to) | 11-20 |
Number of pages | 10 |
Journal | Physica C: Superconductivity and its applications |
Volume | 303 |
Issue number | 1-2 |
DOIs | |
State | Published - Jul 10 1998 |
Funding
This research was supported by the National Science Foundation (grant DMR 91-20000) through the Science and Technology Center for Superconductivity. The RBS measurements were performed at the Surface Modification and Characterization facility of the Oak Ridge National Laboratory. The authors also appreciate the assistance by C. Beswick and R. McNeely in the preparation and purification of the boron precursor. Facilities for transport measurements are supported by the National Science Foundation through the Materials Research Center of Northwestern University (grant DMR 9632472).
Keywords
- Chemical vapor deposition
- Infrared spectroscopy
- Oxycarbonate thin films
- RBS spectroscopy
- TEM
- Transport properties
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering