Abstract
We report the high-pressure synthesis of the electron-doped infinite-layer superconductor Sr 0.9La 0.1CuO 2 and its superconducting properties. A Rietveld analysis of X-ray powder diffraction data showed that, within the resolution of the measurement, the sample had purely an infinite-layer structure without any discernible impurities. The superconducting volume fraction and the transition width were greatly improved compared to those in previous reports. The irreversibility field line and the intragranular critical current density were much higher than those of La 1.85Sr 0.15CuO 4 and Nd 1.85Ce 0.15CuO 4. The stronger pinning behaviors are consistent with the strong interlayer coupling due to the short distance between CuO 2 planes.
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