Abstract
From precise analyses of resistivity data and Raman scattering spectra from MgB2 single crystals, we have extracted the electron–phonon (e–p) coupling constants and specified the relevant phonon mode and electronic bands that play a main role in the superconductivity. It has been demonstrated that the strong coupling of the E2g boron vibrational mode with the σ-band holes governs the normal state conduction and the high-Tc superconductivity mechanism. The smaller gap on the π-bands found by k-selective Raman scattering measurements is reconciled with the weak e–p coupling and large scattering rate in these bands.
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