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

Abstract

Perovskite SrRuO3, a prototypical conductive ferromagnetic oxide, exhibits a kink in its band dispersion signalling the unusual electron dynamics therein. However, the origin of this kink remains elusive. By taking advantage of the combo of reactive molecular beam epitaxy and in situ angle-resolved photoemission spectroscopy, we systematically studied the evolution of the low-energy electronic structure of SrRuO3 films with thickness thinning down to nearly two-dimensional limit in a well-controlled way. The kink structure persists even in the 4-unit-cell-thick film. Moreover, through quantitative self-energy analysis, we observed the negligible thickness dependence of the binding energy of the kink, which is in sharp contrast to the downward trend of the Curie temperature with reducing the film thickness. Together with previously reported transport and Raman studies, this finding suggests that the kink of perovskite SrRuO3 should originate from the electron-phonon coupling rather than magnetic collective modes, and the in-plane phonons may play a dominant role. Considering such a kink structure of SrRuO3 is similar to these of many other correlated oxides, we suggest the possible ubiquity of the coupling of electrons to oxygen-related phonons in correlated oxides.

arXiv comment5 pages, 4 figures

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Cited by in corpus (5)

• Temperature-filling phase diagram of the two-dimensional Holstein model in the thermodynamic limit by self-consistent Migdal approximation
• Revealing the Hidden Heavy Fermi Liquid in CaRuO3
• Fermi surface and kink structures in Sr${}_4$Ru${}_3$O${}_{10}$ revealed by synchrotron-based ARPES
• Electronic band structure of (111) $SrRu{O}_3$ thin film$-$an angle-resolved photoemission spectroscopy study
• Layer-dependent spin-resolved electronic structure of ferromagnetic triple-layered ruthenate Sr${}_4$Ru${}_3$O${}_{10}$