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Orbitally selective breakdown of Fermi liquid quasiparticles in Ca 1.8 Sr 0.2 RuO 4

DOI: 10.1103/PhysRevB.99.121115 DOI Help

Authors: D. Sutter (Universität Zürich) , M. Kim (College de France; Ecole Polytechnique, CNRS, Université Paris-Saclay) , C. E. Matt (Universität Zürich) , M. Horio (Universität Zürich) , R. Fittipaldi (CNR-SPIN; Università di Salerno) , A. Vecchione (CNR-SPIN; Università di Salerno) , V. Granata (CNR-SPIN; Università di Salerno) , K. Hauser (Universität Zürich) , Y. Sassa (Uppsala University) , G. Gatti (École Polytechnique Fedérale de Lausanne (EPFL)) , M. Grioni (École Polytechnique Fedérale de Lausanne (EPFL)) , M. Hoesch (Diamond Light Source) , T. K. Kim (Diamond Light Source) , E. Rienks (Helmholtz Zentrum Berlin, Bessy II) , N. C. Plumb (Swiss Light Source) , M. Shi (Swiss Light Source) , T. Neupert (Universität Zürich) , A. Georges (College de France; Ecole Polytechnique, CNRS, Université Paris-Saclay; University of Geneva; Flatiron Institute) , J. Chang (Universität Zürich)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 99

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 15296

Abstract: We present a comprehensive angle-resolved photoemission spectroscopy study of Ca 1.8 Sr 0.2 RuO 4 . 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 x z , d y z orbitals display Fermi liquid behavior with fourfold quasiparticle mass renormalization. Extremely heavy fermions—associated with a predominantly d x y band character—are shown to display non-Fermi-liquid behavior. We thus demonstrate that Ca 1.8 Sr 0.2 RuO 4 is a hybrid metal with an orbitally selective Fermi liquid quasiparticle breakdown.

Journal Keywords: Exotic phases of matter; Fermi surface; Metal-insulator transition

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: Swiss Light Source; BESSY