Fate of quasiparticles at high temperature in the correlated metal Sr2RuO4

DOI: 10.1103/PhysRevLett.131.236502

Authors: A. Hunter (University of Geneva) , S. Beck (Flatiron Institute) , E. Cappelli (University of Geneva) , F. Margot (University of Geneva) , M. Straub (University of Geneva) , Y. Alexanian (University of Geneva) , G. Gatti (University of Geneva) , M. D. Watson (Diamond Light Source) , T. K. Kim (Diamond Light Source) , C. Cacho (Diamond Light Source) , N. cc. Plumb (Swiss Light Source, Paul Scherrer Institut) , M. Shi (Swiss Light Source, Paul Scherrer Institut) , M. Radović (Swiss Light Source, Paul Scherrer Institut) , D. A. Sokolov (Max Planck Institute for Chemical Physics of Solids) , A. p. Mackenzie (Max Planck Institute for Chemical Physics of Solids; University of St. Andrews) , M. Zingl (Flatiron Institute) , J. Mravlje (Institute Jozef Stefan; University of Ljubljana) , A. Georges (University of Geneva; Flatiron Institute; Collège de France; Ecole Polytechnique, CNRS, Institut Polytechnique de Paris) , F. Baumberger (University of Geneva; Swiss Light Source, Paul Scherrer Institut) , A. Tamai (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 131

State: Published (Approved)
Published: December 2023
Diamond Proposal Number(s): 25083

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 semiquantitative agreement with dynamical mean field theory calculations.

Journal Keywords: Electronic structure; Quasiparticles & collective excitations; Ruthenates; Strongly correlated systems; Angle-resolved photoemission spectroscopy; Dynamical mean field theory

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: SIS at SLS

Added On: 13/12/2023 08:24

Discipline Tags:

Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)