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Publication Detail / Abstract

D. Sutter, M. Kim, C. E. Matt, M. Horio, R. Fittipaldi, A. Vecchione, V. Granata, K. Hauser, Y. Sassa, G. Gatti, M. Grioni, M. Hoesch, T. K. Kim, E. Rienks, N. C. Plumb, M. Shi, T. Neupert, A. Georges, J. Chang

Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8/Sr0.2/RuO4

published on Physical Review B on March 29, 2019
> Full text via publisher
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 dxz,dyz orbitals display Fermi liquid behavior with fourfold quasiparticle mass renormalization. Extremely heavy fermions—associated with a predominantly dxy 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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