Reduction dependence of superconductivity in undoped T' cuprates

Details Reduction dependence of superconductivity in undoped T' cuprates Reduction dependence of superconductivity in undoped T' cuprates

2008-11-07

arxiv.org/abs/0811.1077v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures; International Symposium on Superconductivity 2008

Scientific paper

We have recently achieved superconductivity in undoped T'-RE2CuO4 (RE: Pr, Nd, Sm, Eu, and Gd), using epitaxial thin films by metal organic decomposition. The key recipes to achieve superconductivity are low-PO2 firing and subsequent vacuum reduction to minimize the amount of impurity oxygen atoms, which are very harmful to high-Tc superconductivity. In this article, we report our investigation on the reduction dependence of superconductivity of T'-RE2CuO4. For thin films, the amount of remnant Oap atoms is difficult to evaluate but we propose that one good measure for this may be the c-axis lattice constant, which tells us whether the reduction is insufficient or excessive.

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