Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of the kink in the band dispersion of the ferromagnetic
  perovskite SrRuO3: Electron-phonon coupling   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.

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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: astro-ph