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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 (2019). Orbitally selective breakdown of Fermi liquid quasiparticles in Ca1.8Sr0.2RuO4. Physical review. B, 99(12):121115.

Abstract

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.

Abstract

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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:29 March 2019
Deposited On:04 Jun 2019 16:04
Last Modified:17 Jul 2019 03:14
Publisher:American Physical Society
ISSN:2469-9950
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevb.99.121115

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