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キーワード:
Fermi liquids, Mean field theory, Strontium compounds, Temperature, Angle-resolved photoemission, Bad metals, Dynamical mean-field theory, Highest temperature, Increasing temperatures, Metal state, Quasiparticles, Self energy, Spectral function, Temperature evolution, Ruthenium compounds
要旨:
We study the temperature evolution of quasiparticles in the correlated metal Sr2RuO4. Our angle resolved photoemission data show that quasiparticles persist up to temperatures above 200 K, far beyond the Fermi liquid regime. Extracting the quasiparticle self-energy, we demonstrate that the quasiparticle residue Z increases with increasing temperature. Quasiparticles eventually disappear on approaching the bad metal state of Sr2RuO4 not by losing weight but via excessive broadening from super-Planckian scattering. We further show that the Fermi surface of Sr2RuO4
