| Two Superconducting Phases and Their Characteristics in Layered BaTi2（Sb1-xBix）2O with x=0.16 |
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| 作者姓名： | 伍岳 董晓莉 马明伟 杨槐馨 张超 周放 周兴江 赵忠贤 |
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| 作者单位： | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 11274358 and 11190020, and the National Basic Research Program of China under Grant Nos 2013CB921700 and 2011CB921703. The authors would like to thank Professor Li Jianqi for the valuable discussion. |
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| 摘 要： | Two correlated superconducting phases are identified in the layered superconductor BaTh （Sb1-xBix）2O （x = 0.16）, with the superconducting transition temperatures of Tc = 6K （the high Tc phase） and 3.4K （the low Tc Phase）, respectively. The 6K superconducting phase appears first in the as-prepared sample and can decay into the low TC phase by exposure to an ambient atmosphere for a certain duration. Specially, the high Tc phase can reappear from the decayed sample with the low Tc phase by vacuum annealing. It is also found that the CDW /SDW order occurs only with the 6 K superconducting phase. These notable features and alteration of the superconductivity due to the post-processing and external pressure can be explained by the scenario of electronic phase separation.
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| 关 键 词： | 超导相 超导转变温度 层状超导体 低温度系数 持续时间 真空退火 超导电性 外部压力 |
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