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

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Abstract

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
Volume15
Issue number5
Publication statusPublished - 2002 Dec 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mun, M. O., Kim, Y. J., Park, Y., Kim, J. H., Moon, S. H., Lee, H. N., Kim, H. G., & Oh, B. (2002). Normal-state optical response functions of MgB2 superconductor. Journal of Superconductivity and Novel Magnetism, 15(5), 475-477.