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Temperature and magnetic field dependent optical properties of superconducting $MgB_2$ thin film
정종훈,이해자,김경완,김명훈,노태원,강원남,정창욱,이성익,Jung, J. H.,Lee, H. J.,Kim, K. W.,Kim, M. W.,Noh, T. W.,Wang, Y. J.,Kang, W. N.,Jung, C. U.,Lee, Sung-Ik 한국초전도학회 2001 Progress in superconductivity Vol.3 No.1
We investigated the temperature and magnetic field dependent optical properties of a$ MgB_2$ thin film in the far-infrared region. In the superconducting state, i.e. 5 K, we obtained the values of superconducting gap $2\Delta$ ~ 5.2 meV and $2\Delta$ $_{k}$ $B/T_{c}$ ~1.8. Although the value of$ 2\Delta$</TEX$B/T_{c}$ was nearly half of the BCS value, the $2\Delta$ seemed to follow the temperature dependence of the BCS formula. Under the magnetic field (H), the superconducting state became suppressed. Interestingly, we found that the normal state area fraction abruptly increased at low field but slowly increased at high field. It did not follow the H-dependences predicted for a s-wave superconductor (i.e. a linear dependence) nor for a s-wave one (i.e. $H^{1}$2/ dependence). We discussed the complex gap nature of $MgB_2$ in comparison with two gap and anisotropic s-wave scenarios.ios.