Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap
文献类型：期刊论文
| 作者 | Abdel-Hafiez, M ; Pereira, PJ ; Kuzmichev, SA ; Kuzmicheva, TE ; Pudalov, VM ; Harnagea, L ; Kordyuk, AA ; Silhanek, AV ; Moshchalkov, VV ; Shen, B ; Wen, HH ; Vasiliev, AN ; Chen, XJ |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2014 |
| 卷号 | 90期号:5 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Abdel-Hafiez, M (reprint author), Ctr High Pressure Sci & Technol Adv Res, 1690 Cailun Rd, Shanghai 201203, Peoples R China. |
| 中文摘要 | Using two experimental techniques, we studied single crystals of the 122-FeAs family with almost the same critical temperature, T-c. We investigated the temperature dependence of the lower critical field H-c1(T) of a Ca0.32Na0.68Fe2As2 (T-c approximate to 34 K) single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the London penetration depth can be described equally well either by a single anisotropic s-wave-like gap or by a two-gap model, while a d-wave approach cannot be used to fit the London penetration depth data. Intrinsic multiple Andreev reflection effect spectroscopy was used to detect bulk gap values in single crystals of the intimate compound Ba0.65K0.35Fe2As2, with the same T-c. We estimated the range of the large gap value Delta(L) = 6-8 meV (depending on small variation of T-c) and its a k space anisotropy of about 30%, and the small gap Delta(S) approximate to 1.7 +/- 0.3 meV. This clearly indicates that the gap structure of our investigated systems more likely corresponds to a nodeless s-wave two gaps. |
| 资助信息 | FNRS projects "Credit de demarrage U.Lg."; COST Action [MP1201]; Methusalem Funding of the Flemish Government; Russian Foundation for Basic Research [13-02-01180-a, 14-02-90425, 14-02-92002-a]; Civilian Research Development Foundation [FSAX-14-60108-0, 73-02-14]; NSF of China; Ministry of Science and Technology of China (973 project) [2011CBA00102, 2012CB821403, 2010CB923002]; PAPD |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59511]  |
| 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 | Abdel-Hafiez, M,Pereira, PJ,Kuzmichev, SA,et al. Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap[J]. PHYSICAL REVIEW B,2014,90(5). |
| APA | Abdel-Hafiez, M.,Pereira, PJ.,Kuzmichev, SA.,Kuzmicheva, TE.,Pudalov, VM.,...&Chen, XJ.(2014).Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap.PHYSICAL REVIEW B,90(5). |
| MLA | Abdel-Hafiez, M,et al."Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap".PHYSICAL REVIEW B 90.5(2014). |
入库方式： OAI收割
来源：物理研究所
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