The Bcs-eliashberg Theory Of Superconductivity Of Magnesium Diboride (of Mgb <sub> 2 </ Sub>) Of High Temperature Superconductivity,

In this paper, We have investigated the high temperature superconductivity (T - 39/0 of MgB2 by use of the BCS weak coupling superconducting micro-scopic theory and Eliashberg strong coupling superconducting microscopic theory. In the BCS theory of weak coupling, the thesis probes into the calculating formula of the electron-phonon interaction constant N(0)V and the calculating method of Debye temperature , pointing out that since N(0)V deduction only involves the interaction between longitudinal acoustics mould and electrons, it's passable that in the formula Tc = 0.850D exp{ only chooses the longitudinal Debye temperature, QD - QDL = sga and the result Theor- = 38.7/C perfectly tallies with the experimental values. In the theory of strong coupling, the thesis puts forward the calculating formula of the effective phonon specturum a2(u>)F(w) and the electron-phonon coupling constant A = 2(u>)F(u) . The theoretical calculation of MgB2 superconductor shows that - 0.749, the value comparatively approaches the overseas theoretical calculating result. T = 26AK is calculated by using Coulomb pseudopotential - = 1.1026, employing these data and with the formula of McMillan Tc. From this we can draw a conclusion that MgBg superconductor is comparatively near to BCS superconductive materials of weak coupling.