Normal-state optical response functions of MgB2 superconductor

Mi Ock Mun, Young Jin Kim, Yu Park, Jae Hoon Kim, S. H. Moon, H. N. Lee, H. G. Kim, B. Oh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)475-477
Number of pages3
JournalJournal of Superconductivity and Novel Magnetism
Issue number5
Publication statusPublished - 2002

Bibliographical note

Funding 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


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