Superconductivity in bulk T?(La,Sm)2CuO4 prepared via a molten alkaline hydroxide route
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- 作者：S. Asai ; S. Ueda ; M. Naito ; minaito@cc.tuat.ac.jp
- 关键词：La-based superconductor ; Parent compounds ; Nd2CuO4 structure ; Molten alkaline hydroxides route ; Apical oxygen
- 刊名：Physica C
- 出版年：2011
- 出版时间：November, 2011
- 年：2011
- 卷：471
- 期：21-22
- 页码：682-685
- 全文大小：1K
文摘
We have synthesized La2?/sub>xSmxCuO4 (0 ?#xA0;x ?#xA0;2.0) with the Nd2CuO4 structure via a molten alkaline hydroxide route at temperatures as low as 400-480 ¡ãC. After reduction heat treatment in vacuum at 600-750 ¡ãC for removal of excess oxygen atoms at the interstitial apical site, superconductivity with Tc = 20-24 K was observed in the samples with x = 0.05-1.0. The superconducting volume fraction is nearly 100 % for x = 0.3-0.7. Our results demonstrate that La2?/sub>xSmxCuO4 with no nominal carrier doping is a bulk superconductor.