Formation and consequences of heavy d-electron quasiparticles in Sr3Ru2O7

Abstract

We report angle-resolved photoelectron spectroscopy measurements of the quantum critical metal Sr3Ru2O7 revealing itinerant Ru 4d-states confined over large parts of the Brillouin zone to an energy range of < 6 meV, nearly three orders of magnitude lower than the bare band width. We show that this energy scale agrees quantitatively with a characteristic thermodynamic energy scale associated with quantum criticality and illustrate how it arises from the hybridization of light and strongly renormalized, heavy quasiparticle bands. For the largest Fermi surface sheet we find a marked k-dependence of the renormalization and show that it correlates with the Ru 4d - O 2p hybridization.

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• Theory of the Strange Metal Sr${}_3$Ru${}_2$O${}_7$
• On the engineering of higher-order Van Hove singularities in two dimensions
• Low temperature thermodynamic investigation of the phase diagram of Sr${}_3$Ru${}_2$O${}_7$
• Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film
• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Electronic Structure and Magnetism of the Triple-layered Ruthenate Sr${}_4$Ru${}_3$O${}_{10}$
• Fermi surface and kink structures in Sr${}_4$Ru${}_3$O${}_{10}$ revealed by synchrotron-based ARPES
• Flat Bands and Enigma of Metamagnetic Quantum Critical Regime in Sr3Ru2O7
• Evolution of Interorbital Superconductor to Intraorbital Spin-Density Wave in Layered Ruthenates
• Second-order response theory of radio-frequency spectroscopy for cold atoms
• Layer-dependent spin-resolved electronic structure of ferromagnetic triple-layered ruthenate Sr${}_4$Ru${}_3$O${}_{10}$
• Characterizing Featureless Mott Insulating State by Quasiparticle Interferences - A Dynamical Mean Field Theory Prospect
• Triplet superconductivity supported by an X${}_9$ high-order Van Hove singularity