Electron–phonon coupling in the superconducting single crystal Rb0. 8Fe1. 68Se2
The optical properties of the superconducting single crystal Rb 0.8 Fe 1.68 Se 2 with T c≃ 31
K have been measured over a wide frequency range in the ab plane. We found that the
optical conductivity is dominated by a series of infrared-active phonon modes at low-
frequency region as well as several other high-frequency bound excitations. The low-
frequency optical conductivity has rather low value and shows quite small Drude-like
response, indicating low carriers density in this material. Furthermore, the phonon modes …
K have been measured over a wide frequency range in the ab plane. We found that the
optical conductivity is dominated by a series of infrared-active phonon modes at low-
frequency region as well as several other high-frequency bound excitations. The low-
frequency optical conductivity has rather low value and shows quite small Drude-like
response, indicating low carriers density in this material. Furthermore, the phonon modes …