The High Pressure Synthesis and Properties of Apical Oxygen Doped High Tc Superconductors
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摘要: 简要介绍了(Sr,Ca)n+1CunO2n(Cl,O)2，即三元数法的Cl-02n（或四元数Cl-02(n-1)n）超导系列，简称Cl-系超导体。和通常的高温超导体不同，Cl-系的电荷库由卤化物构成，而非通常的氧化物。即Cl-系的导电区和电荷库由顶角氯连接，根据这一结构特点用顶角氧掺杂，高压合成了Tc80 K的(Sr,Ca)3Cu2O4(Cl,O)2超导体。该化合物具有和全氧化物高温超导体可比的超导性能，表明高温高压合成全新的卤氧超导新材料的潜力，以及开发卤氧化物高温超导体群的研究前景。
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关键词:
- 高温超导体（HTSC） /
- 顶角氧掺杂 /
- 高温高压合成
Abstract: The (Sr,Ca)n+1CunO2n(Cl,O)2 superconducting homologous series have been briefly introduced. The emphasis is on the special charge reservoir block of the oxyhalide high Tc superconductror (HTSC), which consists of the halide layer instead of the routine oxide layer. Consequently the apical oxygen related to the p-type HTSC is missed in the compound whereas the apical chlorine bridges the conducting layer and the charge reservoir. In the context a novel hole doping mechanism named apical oxygen doping was introduced through partially substituting oxygen for chlorine. This chemical doping leads to an 80 K superconducting transition in the high pressure synthesized double layered (Sr,Ca)3Cu2O4(Cl,O)2 oxyhalide. Not only the high Tc, the oxyhalide cuprate superconductor also demonstrates the comparable physical properties to those of the full oxide HTSC, indicating the promising prospects to develop new high Tc oxyhalide superconductors. -
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