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Fate of Quasiparticles at High Temperature in the Correlated Metal Sr2RuO4

Published inPhysical review letters, vol. 131, 236502
Publication date2023-12-08
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.

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HUNTER, Andrew Scott et al. Fate of Quasiparticles at High Temperature in the Correlated Metal Sr<sub>2</sub>RuO<sub>4</sub>. In: Physical review letters, 2023, vol. 131, p. 236502. doi: 10.1103/PhysRevLett.131.236502
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ISSN of the journal0031-9007
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Creation08/22/2023 7:28:49 AM
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