Quasiparticle Mass Enhancement and Temperature Dependence of the   Electronic Structure of Ferromagnetic SrRuO3 Thin Films
  We report high-resolution angle-resolved photoemission studies of epitaxial thin films of the correlated 4d transition metal oxide ferromagnet SrRuO3. The Fermi surface in the ferromagnetic state consists of well-defined Landau quasiparticles, exhibiting strong coupling to low-energy bosonic modes which contributes to the large effective masses observed by transport and thermodynamic measurements. Upon warming the material through its Curie temperature, we observe a substantial decrease in quasiparticle coherence, but negligible changes in the ferromagnetic exchange splitting, suggesting that local moments play an important role in the ferromagnetism in SrRuO3. 
D.E. Shai, C. Adamo, D.W. Shen, C.M. Brooks, J.W. Harter, E.J.   Monkman, B. Burganov, D.G. Schlom, K.M. Shen
cond-mat.str-el cond-mat.mtrl-sci