Angle-Resolved Photoemission Spectroscopy of Iron-Chalcogenide Superconductor Fe1.03Te0.7Se0.3 : Strong-Coupling Superconductivity and Universality of Inter-Band Scattering
| Autor: | Nakayama, K., Sato, T., Richard, P., Kawahara, T., Sekiba, Y., Qian, T., Chen, G. F., Luo, J. L., Wang, N. L., Ding, H., Takahashi, T. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 105, 197001 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physc.2011.05.014 |
| Popis: | We have performed high-resolution angle-resolved photoemission spectroscopy of iron-chalcogenide superconductor Fe1.03Te0.7Se0.3 (Tc = 13 K) to investigate the electronic structure relevant to superconductivity. We observed a hole- and an electron-like Fermi surfaces at the Brillouin zone center and corner, respectively, which are nearly nested by the Q~(pi, pi) wave vector. We do not find evidence for the nesting instability with Q~(pi+delta, 0) reminiscent of the antiferromagnetic order in the parent compound Fe1+yTe. We have observed an isotropic superconducting gap along the hole-like Fermi surface with the gap size Delta of ~4 meV (2Delta/kBTc~7), demonstrating the strong-coupling nature of the superconductivity. The observed similarity of low-energy electronic excitations between iron-chalcogenide and iron-arsenide superconductors strongly suggests that common interactions which involve Q~(pi, pi) scattering are responsible for the superconducting pairing. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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