Momentum dependence of superconducting gap, strong-coupling dispersion kink, and tightly bound Cooper pairs in the high-T-c (Sr,Ba)(1-x)(K,Na)(x)Fe2As2 superconductors
文献类型：期刊论文
| 作者 | Wray, L ; Qian, D ; Hsieh, D ; Xia, Y ; Li, L ; Checkelsky, JG ; Pasupathy, A ; Gomes, KK ; Parker, CV ; Fedorov, AV ; Chen, GF ; Luo, JL ; Yazdani, A ; Ong, NP ; Wang, NL ; Hasan, MZ |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2008 |
| 卷号 | 78期号:18 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Hasan, MZ: Princeton Univ, Dept Phys, Joseph Henry Labs Phys, Princeton, NJ 08544 USA. |
| 中文摘要 | We present a systematic angle-resolved photoemission spectroscopic study of the high-T-c superconductor class (Sr/Ba)(1-x)KxFe2As2. By utilizing a photon-energy-modulation contrast and scattering geometry we report the Fermi surface and the momentum dependence of the superconducting gap, Delta((k) over right arrow). A prominent quasiparticle dispersion kink reflecting strong scattering processes is observed in a binding-energy range of 25-55 meV in the superconducting state, and the coherence length or the extent of the Cooper pair wave function is found to be about 20 angstrom, which is uncharacteristic of a superconducting phase realized by the BCS-phonon-retardation mechanism. The observed 40 +/- 15 meV kink likely reflects contributions from the frustrated spin excitations in a J(1)-J(2) magnetic background and scattering from the soft phonons. Results taken collectively provide direct clues to the nature of the pairing potential including an internal phase-shift factor in the superconducting order parameter which leads to a Brillouin zone node in a strong-coupling setting. |
| 收录类别 | SCI |
| 资助信息 | DOE [DEFG-02-05ER46200]; NSF [DMR-0213706] |
| 语种 | 英语 |
| 公开日期 | 2013-09-18 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/42275]  |
| 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 | Wray, L,Qian, D,Hsieh, D,et al. Momentum dependence of superconducting gap, strong-coupling dispersion kink, and tightly bound Cooper pairs in the high-T-c (Sr,Ba)(1-x)(K,Na)(x)Fe2As2 superconductors[J]. PHYSICAL REVIEW B,2008,78(18). |
| APA | Wray, L.,Qian, D.,Hsieh, D.,Xia, Y.,Li, L.,...&Hasan, MZ.(2008).Momentum dependence of superconducting gap, strong-coupling dispersion kink, and tightly bound Cooper pairs in the high-T-c (Sr,Ba)(1-x)(K,Na)(x)Fe2As2 superconductors.PHYSICAL REVIEW B,78(18). |
| MLA | Wray, L,et al."Momentum dependence of superconducting gap, strong-coupling dispersion kink, and tightly bound Cooper pairs in the high-T-c (Sr,Ba)(1-x)(K,Na)(x)Fe2As2 superconductors".PHYSICAL REVIEW B 78.18(2008). |
入库方式： OAI收割
来源：物理研究所
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