Strong coupling superconductivity and prominent superconducting fluctuations in the new superconductor Bi4O4S3
文献类型：期刊论文
| 作者 | Li, S ; Yang, H ; Fang, DL ; Wang, ZY ; Tao, J ; Ding, XX ; Wen, HH |
| 刊名 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
 |
| 出版日期 | 2013 |
| 卷号 | 56期号:11页码:2019 |
| 关键词 | BiS2-based superconductor strong coupling superconductivity superconducting fluctuation |
| ISSN号 | 1674-7348 |
| 通讯作者 | Yang, H (reprint author), Nanjing Univ, Natl Lab Solid State Microstruct, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China. |
| 中文摘要 | Electric transport and scanning tunneling spectrum (STS) have been investigated on polycrystalline samples of the new superconductor Bi4O4S3. A weak insulating behavior in the resistive curve has been induced in the normal state when the superconductivity is suppressed by applying a magnetic field. Interestingly, a kink appears on the temperature dependence of resistivity near 4 K at all high magnetic fields above 1 T when the bulk superconductivity is completely suppressed. This kink associated with the upper critical field as well as the wide range of excess conductance at low fields and high temperatures is explained as the possible evidence of strong superconducting fluctuation. From the tunneling spectra, a superconducting gap of about 3 meV is frequently observed yielding a ratio of 2 Delta/k (B) T (C) similar to 16.6. This value is much larger than the one predicted by the BCS theory in the weak coupling regime (2 Delta/k (B) T (C) similar to 3.53), which suggests the strong coupling superconductivity in the present system. Furthermore, the gapped feature persists on the spectra until 14 K in the STS measurement, which suggests a prominent fluctuation region of superconductivity. Such a superconducting fluctuation can survive at very high magnetic fields, which are far beyond the critical fields for bulk superconductivity as inferred both from electric transport and tunneling measurements. |
| 资助信息 | 973 Project of the Ministry of Science and Technology of China [2011CBA001002, 2010CB923002, 2012CB821403]; National Natural Science Foundation of China [11034011]; Program for New Century Excellent Talents in University [NCET-12-0255]; Priority Academic Program Development of Jiangsu Higher Education Institutions |
| 语种 | 英语 |
| 公开日期 | 2014-01-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57481]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li, S,Yang, H,Fang, DL,et al. Strong coupling superconductivity and prominent superconducting fluctuations in the new superconductor Bi4O4S3[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2013,56(11):2019. |
| APA | Li, S.,Yang, H.,Fang, DL.,Wang, ZY.,Tao, J.,...&Wen, HH.(2013).Strong coupling superconductivity and prominent superconducting fluctuations in the new superconductor Bi4O4S3.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,56(11),2019. |
| MLA | Li, S,et al."Strong coupling superconductivity and prominent superconducting fluctuations in the new superconductor Bi4O4S3".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 56.11(2013):2019. |
入库方式： OAI收割
来源：物理研究所
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