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Perovskite SrRuO3, a prototypical conductive ferromagnetic oxide, exhibits akink in its band dispersion signalling the unusual electron dynamics therein.However, the origin of this kink remains elusive. By taking advantage of thecombo of reactive molecular beam epitaxy and in situ angle-resolvedphotoemission spectroscopy, we systematically studied the evolution of thelow-energy electronic structure of SrRuO3 films with thickness thinning down tonearly two-dimensional limit in a well-controlled way. The kink structurepersists even in the 4-unit-cell-thick film. Moreover, through quantitativeself-energy analysis, we observed the negligible thickness dependence of thebinding energy of the kink, which is in sharp contrast to the downward trend ofthe Curie temperature with reducing the film thickness. Together withpreviously reported transport and Raman studies, this finding suggests that thekink of perovskite SrRuO3 should originate from the electron-phonon couplingrather than magnetic collective modes, and the in-plane phonons may play adominant role. Considering such a kink structure of SrRuO3 is similar to theseof many other correlated oxides, we suggest the possible ubiquity of thecoupling of electrons to oxygen-related phonons in correlated oxides.

Origin of the kink in the band dispersion of the ferromagnetic perovskite SrRuO3: Electron-phonon coupling