The fate of quasiparticles at high-temperature

Abstract

We study the temperature evolution of quasiparticles in the correlated metal Sr${}_2$RuO${}_4$. 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 Sr${}_2$RuO${}_4$ not by losing weight but via excessive broadening from super-Planckian scattering. We further show that the Fermi surface of Sr${}_2$RuO${}_4$ - defined as the loci where the spectral function peaks - deflates with increasing temperature. These findings are in semi-quantitative agreement with dynamical mean field theory calculations.

Supplemental Material available upon request

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Cited by in corpus (12)

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• Common behavior of the scaled condensation energy for both high-$T_c$ and conventional superconductors
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Finite Temperature Minimal Entangled Typical Thermal States Impurity Solver
• Optical and acoustic plasmons in the layered material Sr${}_2$RuO${}_4$
• Frequency-Dependent Superconducting States From the Two-Time Linear Response Theory: Application To Sr${}_2$RuO${}_4$
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Fragility of Topology under Electronic Correlations in Iron Chalcogenides
• Scaling behavior of superconductors
• Fate of Bosonic Topological Edge Modes in the Presence of Many-Body Interactions