Superconductivity at 45 K in La2CuO4+δ oxidized by NaClO |
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| Authors: | Q.Y. Tu X.L. Chen B.K. Ma Z.X. Zhao Y.C. Lan J.K. Liang |
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| Affiliation: | (1) Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, P.R. China, CN;(2) Department of Physics, Beijing Normal University, Beijing 100875, P.R. China, CN;(3) National Laboratory of Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, P.R. China, CN |
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| Abstract: | ![]()
An efficient and convenient oxidizing agent, sodium hypochlorite solution, has been used to chemically prepare the superconductor La2CuO4+δ at room temperature. The crystallographic data show an enhanced orthorhombic distortion and an increase of the unit-cell volume. The magnetic susceptibility properties reveal a sharp transition beginning at 45 K and the oxidized sample is a homogeneous and single-phase bulk superconductor. The iodometric titration measurements indicate that the oxidized sample has a higher excess-oxygen content of 0.11. Scanning electron microscope observations showed that no grain size difference was observed for the sample before and after oxidation. Received: 15 September 2000 / Accepted: 19 January 2001 / Published online: 3 April 2001 |
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| Keywords: | PACS: 74.72.Dn 74.62.Dh |
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