A trial of carrier doping into Ca1-xSrxCuO2 has been made through partial substitution by conventional solid-state reaction under ambient pressure. The element Y or Na has been taken for the Ca-site substitution, Ga or Li for the Cu site, and F for the O site. It is hard to carry out hole doping into Ca1-xSrxCuO2. As for electron doping, electron carriers are most doped in samples within the solid-solution limit of y≈0.05 in Ca0.86-ySr0.14YyCuO2, but the carrier concentration estimated from the Hall coefficient is still too small to bring superconductivity. Almost all of the samples remain semiconductor-like and no samples show superconductivity of the bulk above 4.2 K. These results are discussed in relation to the oxygen stoichiometry and the Madelung potential. In addition, resistive and magnetic anomalies observed at about 50 K in several samples of Ca0.82Sr0.16Y0.02CuO2 are described.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering