Sutter, D.Kim, M.Matt, C. E.Horio, M.Fittipaldi, R.Vecchione, A.Granata, VHauser, K.Sassa, Y.Gatti, G.Grioni, M.Hoesch, M.Kim, T. K.Rienks, E.Plumb, N. C.Shi, M.Neupert, T.Georges, A.Chang, J.2019-06-182019-06-182019-06-182019-03-2910.1103/PhysRevB.99.121115https://infoscience.epfl.ch/handle/20.500.14299/158109WOS:000462901300002We present a comprehensive angle-resolved photoemission spectroscopy study of Ca1.8Sr0.2RuO4. Four distinct bands are revealed and along the Ru-O bond direction their orbital characters are identified through a light polarization analysis and comparison to dynamical mean-field theory calculations. Bands assigned to d(xz),d(yz) orbitals display Fermi liquid behavior with fourfold quasiparticle mass renormalization. Extremely heavy fermions-associated with a predominantly d(xy) band character-are shown to display non-Fermi-liquid behavior. We thus demonstrate that Ca1.8Sr0.2RuO4 is a hybrid metal with an orbitally selective Fermi liquid quasiparticle breakdown.Materials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterMaterials SciencePhysicsphotoemissiontransitiontext::journal::journal article::research article