The reflectivity of superconducting MgB2 (Tc = 39 K) has been measured on a randomly oriented thin film at room temperature over a wide-range of frequencies, 20 ≤ ω < 100000 cm-1. The conductivity shows highly metallic behavior but cannot be explained with a simple Drude model alone. The electronic contribution is analyzed by a generalized Drude model. The scattering rate 1/τ(ω) and the mass renormalization ratio m*(ω)/m = 1 + λ(ω) exhibit clear frequency dependence. The electron-phonon coupling strength is estimated to be λ ∼ 1.5 ± 0.5 while the plasma frequency ωp is 2.4 eV.
|Number of pages||3|
|Journal||Journal of Superconductivity and Novel Magnetism|
|Publication status||Published - 2002|
Bibliographical noteFunding Information:
This work was supported by Grant No. R03-2000-000-00001-0 from the Basic Research Program of the Korea Science & Engineering Foundation. JHK and BO were supported by the Electron Spin Science Center at POSTECH and the National Research Laboratory Project, funded by the Korea Science & Engineering Foundation(KOSEF), respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics