Normal-State Optical Response Functions of MgB2 Superconductor |
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| Authors: | Mi-Ock Mun Young Jin Kim Yu Park Jae Hoon Kim S H Moon H N Lee H G Kim and B Oh |
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| Affiliation: | (1) Institute of Physics and Applied Physics and Department of Physics, Yonsei University, Seoul, 120-749, Korea;(2) LG Electronics Institute of Technology, Seoul, 137-724, Korea |
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| Abstract: | The reflectivity of superconducting MgB2 (T
c = 39 K) has been measured on a randomly oriented thin film at room temperature over a wide-range of frequencies, 20   < 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/ () and the mass renormalization ratio m*()/m = 1 +  () exhibit clear frequency dependence. The electron–phonon coupling strength is estimated to be  1.5 ± 0.5 while the plasma frequency p is 2.4 eV. |
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| Keywords: | MgB2 superconductivity optical property electron– phonon coupling |
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