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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Orbitally selective breakdown of Fermi liquid quasiparticles in Ca 1.8 Sr 0.2 RuO 4 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 Physical Review B 99 DOI: 10.1103/PhysRevB.99.121115 Diamond Proposal Number(s): [15296] Show Abstract ▼ 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.	Mar 2019
I05-ARPES	Direct observation of orbital hybridisation in a cuprate superconductor C. E. Matt , D. Sutter , A. M. Cook , Y. Sassa , Martin Mansson , O. Tjernberg , L. Das , M. Horio , D. Destraz , C. G. Fatuzzo , K. Hauser , M. Shi , M. Kobayashi , V. N. Strocov , T. Schmitt , P. Dudin , M. Hoesch , S. Pyon , T. Takayama , H. Takagi , O. J. Lipscombe , S. M. Hayden , T. Kurosawa , N. Momono , M. Oda , T. Neupert , J. Chang Nature Communications 9 DOI: 10.1038/s41467-018-03266-0 Diamond Proposal Number(s): [10550] Open Access Show Abstract ▼ Abstract: The minimal ingredients to explain the essential physics of layered copper-oxide (cuprates) materials remains heavily debated. Effective low-energy single-band models of the copper–oxygen orbitals are widely used because there exists no strong experimental evidence supporting multi-band structures. Here, we report angle-resolved photoelectron spectroscopy experiments on La-based cuprates that provide direct observation of a two-band structure. This electronic structure, qualitatively consistent with density functional theory, is parametrised by a two-orbital (d x 2 −y 2 dx2-y2 and d z 2 dz2 ) tight-binding model. We quantify the orbital hybridisation which provides an explanation for the Fermi surface topology and the proximity of the van-Hove singularity to the Fermi level. Our analysis leads to a unification of electronic hopping parameters for single-layer cuprates and we conclude that hybridisation, restraining d-wave pairing, is an important optimisation element for superconductivity.	Mar 2018

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