  The low-energy electronic structure, including the Fermi surface topology, of
the itinerant metamagnet Sr$_{4}$Ru$_{3}$O$_{10}$ is investigated for the first
time by synchrotron-based angle-resolved photoemission. Well-defined
quasiparticle band dispersions with matrix element dependencies on photon
energy or photon polarization are presented. Four bands crossing the
Fermi-level, giving rise to four Fermi surface sheets are resolved; and their
complete topography, effective mass as well as their electron and hole
character are determined. These data reveal the presence of kink structures in
the near-Fermi-level band dispersion, with energies ranging from 30 meV to 69
meV. Together with previously reported Raman spectroscopy and lattice dynamic
calculation studies, the data suggest that these kinks originate from strong
electron-phonon coupling present in Sr$_{4}$Ru$_{3}$O$_{10}$. Considering that
the kink structures of Sr$_{4}$Ru$_{3}$O$_{10}$ are similar to those of the
other three members of the Ruddlesden Popper structured ruthenates, the
possible universality of strong coupling of electrons to oxygen-related phonons
in Sr$_{n+1}$Ru$_{n}$O$_{3n+1}$ compounds is proposed.
