Observation of electronic structure and electron-boson coupling in the low-dimensional superconductor Ta4Pd3Te16

Ternary telluride ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$ is a layered superconductor with quasi-one-dimensional characteristics. It has attracted great research interests due to the possible nodal superconductivity and its interplay with adjacent charge-density wave as well as proposed nontrivial band topology. Here, we report low-energy electronic band structure of ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$ by means of high-resolution laser-based angle-resolved photoemission spectroscopy. We acquired the Fermi surface and detailed band dispersions, directly reflecting its multiband nature. Furthermore, dispersion kinks at \ensuremath{\sim}8 meV below the Fermi level are unambiguously observed, indicative of strong electron-boson coupling. We suggest these kinks are probably due to electron-phonon coupling with effective coupling constants quantified to be \ensuremath{\sim}0.72 and \ensuremath{\sim}0.48 for the ${\ensuremath{\gamma}}_{1}$ and ${\ensuremath{\gamma}}_{2}$ bands, respectively. Our results provide valuable information for future studies on the mechanism of superconductivity as well as its intimacy to charge-density wave in ${\mathrm{Ta}}_{4}{\mathrm{Pd}}_{3}{\mathrm{Te}}_{16}$.