High-pressure growth of Ca<sub>2鈭?/sub><sub>xsub>Na<sub>xsub>CuO<sub>2sub>Cl<sub>2sub> single crystals and pressure effect on superconductivity
- 作者：Runze Yu ; Qingqing Liu ; qqliu@aphy.iphy.ac.cn ; Sijia Zhang ; Xiancheng Wang ; Wei Han ; Changqing Jin ; jin@aphy.iphy.ac.cn
- 关键词：Ca2&minus ; xNaxCuO2Cl2 ; Single crystals ; Pressure effect
- 刊名：Physica C
- 出版年：2012
- 期刊代码：80_09214534
- 类别：ms
- 出版时间：August, 2012
- 卷：478
- 期：Complete
- 页码：29-31
- 文件大小：344 K
摘要
Single crystals of cuprate oxychloride superconductor Ca<sub>2鈭?/sub><sub>xsub>Na<sub>xsub>CuO<sub>2sub>Cl<sub>2sub> (Na-CCOC) with a systematic variant T<sub>csub> as a function of Na content are synthesized under high pressure and high temperature. The pressure effect on the superconducting transition temperature in Na-CCOC single crystal is investigated by electrical resistance measurements up to 6.5 GPa. It is found that the T<sub>csub> decreases almost linearly with increasing pressure, exhibiting a negative pressure shift, which is totally different pressure behavior from that of isostructural (La,Sr)2CuO<sub>4sub> and other cuprate superconductors.