Reduction dependence of superconductivity in the end-member T′ cuprates |
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| Authors: | O Matsumoto A Utsuki A Tsukada H Yamamoto T Manabe M Naito |
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| Institution: | aDepartment of Applied Physics, Tokyo University of Agriculture and Technology, Naka-cho 2-24-16, Koganei, Tokyo 184-8588, Japan;bGeballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA;cNTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan;dNational Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan |
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| Abstract: | We have recently achieved superconductivity in 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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| Keywords: | High-Tc superconductivity Mother compounds Parent-compound superconductors Nd2CuO4 structure Apical oxygen |
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