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.
|ジャーナル||Physica C: Superconductivity and its applications|
|出版ステータス||Published - 2003 5月 1|
|イベント||proceedings of the 23rd international conference on low temper - Hiroshima, Japan|
継続期間: 2002 8月 20 → 2002 8月 27
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