Role of oxygen in the electron-doped superconducting cuprates

Abstract

We report on resistivity and Hall measurements in thin films of the electron-doped superconducting cuprate Pr${}_{2-x}$Ce${}_x$CuO${}_{4\pm \delta }$. Comparisons between x = 0.17 samples subjected to either ion-irradiation or oxygenation demonstrate that changing the oxygen content has two separable effects: 1) a doping effect similar to that of cerium, and 2) a disorder effect. These results are consistent with prior speculations that apical oxygen removal is necessary to achieve superconductivity in this compound.

5 pages, 5 figures

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• Local tunneling spectroscopy of the electron-doped cuprate Sm1.85Ce0.15CuO4
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