| Original Articles |
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Superconductivity of Nd1.85Ce0.15CuO4-y by Electrochemical Oxidation |
| CHEN Ling1;CHE Guang-Can1;LI Hong2;DONG Cheng1;Zhou Fang1;Huang Yu-Zhen1;ZHAO Zhong-Xian1 |
| 1 National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2National Laboratory for Solid State Ionics, Institute of Physics, Academy of Sciences, Beijing 100080
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| Cite this article: |
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CHEN Ling, CHE Guang-Can, LI Hong et al 2000 Chin. Phys. Lett. 17 601-602 |
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Abstract Superconductivity of n-type superconductor Nd1.85Ce0.15CuO4-y(NCCO) by electrochemical oxidation is reported for the first time and the cyclic voltammogram curve for NCCO as working electrode is presented. Investifations indicate that after oxidation, superconductivity of NCCO is improved: Tc is raised from 20K up to 26K, the superconducting volume fraction is increased also. The valence electronic states of oxygen and copper in NCCO are studied by x-ray photoelectron spectroscopy. It is found that the Cu-2p3/2 peak shifts to the higher binding energy side about 0.4eV, which indicates that the valence-state of copper ions is risen up after oxidation. These results imply that hole-carriers exist in n-type superconductor.
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| Keywords:
74.62.-c
82.45.+z
79.60.-i
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Published: 01 August 2000
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| PACS: |
74.62.-c
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(Transition temperature variations, phase diagrams)
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82.45.+z
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79.60.-i
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(Photoemission and photoelectron spectra)
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