The electronic band structure for . The Fermi level corresponds to 0 eV.
The total and partial density of states (DOS) for . The energy scale is presented with respect to the Fermi energy ().
(a) Calculated phonon dispersion curves of . (b) Total and partial density of states for .
Lattice specific heat at constant volume of as a function of temperature.
Schematic eigen displacements of zone-centre optical phonon modes in . All phonon modes are infrared active. The electron-phonon coupling parameter for these phonon modes is also presented.
(a)The TA and branches of along the  direction. The anomalous feature of the branch close to zone centre can be seen clearly. The two transverse acoustic branches are degenerate. (b) Phonon linewidth of the TA and branches due to electron-phonon interaction along the  direction in .
The Eliashberg spectral function () for .
The electron-phonon prefactor () for .
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