Raman scattering investigation of quasi-one-dimensional superconductor Ta₄Pd₃Te₁₆

الأصل · EN

We have performed polarized Raman scattering measurements on the newly discovered superconductor Ta₄Pd₃Te₁₆ (Tc = 4.6 K). We observe twenty-eight out of thirty-three Raman active modes, with frequencies in good accordance with first-principles calculations. Although most of the phonons observed vary only slightly with temperature and do not exhibit any asymmetric profile that would suggest strong electron-phonon coupling, the linewidth of the Ag phonon mode at 89.9 cm⁻¹ shows an unconventional increase with temperature decreasing, which is possibly due to a charge-density-wave transition or the emergence of charge-density-wave fluctuations below a temperature estimated to fall in the 140-200 K range.