Specific heat versus field for LiFe1-xCuxAs
文献类型：期刊论文
| 作者 | Kim, JS ; Stewart, GR ; Xing, LY ; Wang, XC ; Jin, CQ |
| 刊名 | JOURNAL OF PHYSICS-CONDENSED MATTER
 |
| 出版日期 | 2012 |
| 卷号 | 24期号:47 |
| 关键词 | SUPERCONDUCTIVITY LIFEAS |
| ISSN号 | 0953-8984 |
| 通讯作者 | Kim, JS (reprint author), Univ Florida, Dept Phys, Gainesville, FL 32611 USA. |
| 中文摘要 | LiFeAs is one of the new class of iron superconductors with a bulk T-c(onset) in the 15-17 K range. We report on the specific heat characterization of single crystal material prepared by self-flux growth techniques with significantly improved properties, including a much decreased residual gamma, gamma(r) (equivalent to C/T as T -> 0), in the superconducting state. Thus, in contrast to previous explanations of a finite gamma(r) in LiFeAs being due to intrinsic states in the superconducting gap, the present work shows that such a finite residual gamma in LiFeAs is instead a function of sample quality. Further, since LiFeAs has been characterized as nodeless with multiple superconducting gaps, we report here on its specific heat properties in zero and applied magnetic fields, to compare to similar results on nodal iron superconductors. For comparison, we also investigate LiFe0.98Cu0.02As, which has the reduced T-c of approximate to 9 K and an H-c2 of 15 T. Interestingly, although presumably both LiFeAs and LiFe0.98Cu0.02As are nodeless, they clearly show a non-linear dependence of the electronic density of states (proportional to specific heat gamma) at the Fermi energy in the mixed state with the applied field, similar to the Volovik effect for nodal superconductors. However, rather than indicating nodal behavior, the satisfactory comparison with a recent theory for gamma(H) for a superconductor with two isotropic gaps in the presence of impurities argues for nodeless behavior. Thus, in terms of specific heat in a magnetic field, LiFeAs can serve as the prototypical multiband, nodeless iron superconductor. |
| 收录类别 | SCI |
| 资助信息 | NSF; US DOE [DE-FG02-86ER45268] |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/52827]  |
| 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 | Kim, JS,Stewart, GR,Xing, LY,et al. Specific heat versus field for LiFe1-xCuxAs[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2012,24(47). |
| APA | Kim, JS,Stewart, GR,Xing, LY,Wang, XC,&Jin, CQ.(2012).Specific heat versus field for LiFe1-xCuxAs.JOURNAL OF PHYSICS-CONDENSED MATTER,24(47). |
| MLA | Kim, JS,et al."Specific heat versus field for LiFe1-xCuxAs".JOURNAL OF PHYSICS-CONDENSED MATTER 24.47(2012). |
入库方式： OAI收割
来源：物理研究所
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