Abstract
We present a Raman scattering study of Ta2C complemented with density functional perturbation theory (DFPT) calculations. The polarized Raman spectra of Ta2C reveal all symmetry-allowed Raman phonons at and . The phonon dispersion of Ta2C shows that the zone-center Eg frequency is lower than that of the zone-boundary acoustic phonons, resulting in small anharmonic renormalization of the Eg phonon. We demonstrate that the electron-phonon interactions account for almost half of the measured phonon linewidths. The calculated electron-phonon coupling strength λ is not high enough to produce phonon-mediated superconductivity, a result in agreement with experimental observations.
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