| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Two Superconducting Phases and Their Characteristics in Layered BaTi2(Sb1?xBix)2O with x=0.16 |
| WU Yue, DONG Xiao-Li**, MA Ming-Wei, YANG Huai-Xin, ZHANG Chao, ZHOU Fang, ZHOU Xing-Jiang, ZHAO Zhong-Xian** |
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
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| Cite this article: |
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WU Yue, DONG Xiao-Li, MA Ming-Wei et al 2014 Chin. Phys. Lett. 31 077401 |
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Abstract Two correlated superconducting phases are identified in the layered superconductor BaTi2(Sb1?xBix)2O (x=0.16), with the superconducting transition temperatures of TC=6 K (the high TC phase) and 3.4 K (the low TC Phase), respectively. The 6 K 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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Published: 30 June 2014
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| PACS: |
74.81.-g
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(Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities)
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74.70.Xa
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(Pnictides and chalcogenides)
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74.25.-q
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(Properties of superconductors)
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71.45.Lr
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(Charge-density-wave systems)
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