Electron-phonon coupling in the superconducting single crystal RbFeSe
arXiv:1405.6781 · doi:10.1016/j.physc.2014.05.004
Abstract
The optical properties of the superconducting single crystal RbFeSe with 31 K have been measured over a wide frequency range in the 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 increase continuously in frequency with decreasing temperature; specifically, the phonon mode around 200 cm shows an enhanced asymmetry effect at low temperatures, suggesting an increasing electron-phonon coupling in this system.
12 pages, 3 figures
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