Physics – Condensed Matter – Superconductivity
Scientific paper
2011-01-25
Europhysics Letters 93, 57001 (2011)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
10.1209/0295-5075/93/57001
We performed a high-resolution angle-resolved photoemission spectroscopy study of the Tl$_{0.63}$K$_{0.37}$Fe$_{1.78}$Se$_2$ superconductor ($T_c=29$ K). We show the existence of two electronlike bands at the M$(\pi, 0)$ point which cross the Fermi level at similar Fermi wave vectors to form nearly circular electronlike Fermi surface pockets. We observe a nearly isotropic $\sim$ 8.5 meV superconducting gap ($\Delta/k_BT_c\sim 7$) on these Fermi surfaces. Our analysis of the band structure around the Brillouin zone centre reveals two additional electronlike Fermi surfaces: a very small one and a larger one with $k_F$ comparable to the FS pockets at M. Interestingly, a SC gap with a magnitude of $\sim$ 8 meV also develops along the latter FS. Our observations are consistent with the s-wave strong coupling scenario.
Ding Haibing
Dong Chun-Hua
Dong Jingcheng
Fang M.-H.
Qian Tiezheng
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