Low Energy Electronic Structures in Electron-Doped and Hole-Doped Superconducting (Ba/K)(Fe/Co)2As2
Low Energy Electronic Structures in Electron-Doped and Hole-Doped Superconducting (Ba/K)(Fe/Co)2As2
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DOI：
10.1007/s10948-009-0609-z
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发表时间：
2010-01
影响因子：
1.8
通讯作者：
D. Qian;Yuqi Xia;L. Wray;D. Hsieh;M Zahid Hasan
中科院分区：
文献类型：
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作者：
D. Qian;Yuqi Xia;L. Wray;D. Hsieh;M Zahid Hasan
对最佳电子掺杂的BaFe_（1.82）Co_（0.18）As_2（Tc=24 K）和空穴掺杂的Ba_（0.6）K_（0.4）Fe_2As_2（Tc=37 K）超导体进行了系统的高分辨角分辨光电子能谱研究。超导带隙在动量空间中几乎是各向同性的。利用不同的实验几何结构，详细的电子能带结构的实验确定，并与第一原理LDA计算进行比较。总带宽减少了2倍。而在带角附近的低能准粒子色散则表现出4- 5倍的强重整化。
Systematic high resolution angle-resolved photoemission spectroscopic studies have been performed on the optimally electron-doped BaFe1.82Co0.18As2(Tc=24 K) and hole-doped Ba0.6K0.4Fe2As2(Tc=37 K) superconductors. The superconducting gap is nearly isotropic in momentum space. Utilizing different experimental geometries, the detailed electronic band structures were determined experimentally and compared with first principle LDA calculations. The overall bandwidth is reduced by a factor of 2. However, the low energy quasiparticle dispersions near zone corner exhibit stronger renormalization by a factor of 4–5.kzdependence was observed on the electron pockets at zone corner.