Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4
- Sutter, D.
- Kim, M.
- Matt, C. E.
- Horio, M.
- Fittipaldi, R.
- Vecchione, A.
- Granata, V
- Hauser, 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.
DOIAbstract
We 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
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