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- W3005973033 abstract "Abstract Using the Density Functional Theory (DFT) within the Generalized Gradient Approximation (GGA) pseudopotential and plane wave basis method along with the frozen-phonon approach that starts from the ab initio evaluation of the total energy Etot of the solid with frozen-in atomic displacements, it is found that a superposition of A2u and the E2gvibrations modes is the key factor in the superconducting mechanism in MgB2 compound. Electron–Phonon coupling to these A2u and E2g phonon modes especially at the zone-boundary A point of the hexagonal Brilliouin zone leads to an interband hole charge transfer (and transfer back) between in-plane σ bond to the out-of-plane π bond along with an interatomic electron charge transfer (and transfer back) between the Magnesium s-states to the Boron out-of-plane pz-state. The direction of the electronic current is opposite to that of hole current so that it reinforces the polarization associated with these currents and may generate a large dynamical charge at a given critical temperature Tc that drives the compound into the superconducting state." @default.
- W3005973033 created "2020-02-24" @default.
- W3005973033 creator A5021640887 @default.
- W3005973033 date "2020-04-01" @default.
- W3005973033 modified "2023-10-17" @default.
- W3005973033 title "Out-of-plane ionicity versus in-plane covalency interplay and electron–phonon coupling in MgB2 superconductor" @default.
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- W3005973033 doi "https://doi.org/10.1016/j.cjph.2020.01.014" @default.
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