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Optical Response of Sr2RuO4 Reveals Universal Fermi-Liquid Scaling and Quasiparticles Beyond Landau Theory

Published inPhysical review letters, vol. 113, no. 8, 087404
Publication date2014
Abstract

We report optical measurements demonstrating that the low-energy relaxation rate (1/τ) of the conduction electrons in Sr2RuO4 obeys scaling relations for its frequency (ω) and temperature (T) dependence in accordancewithFermi-liquidtheory.Inthethermalrelaxationregime,1/τ~(ħω)^2+(pπkT)^2 withp=2, and ω/T scaling applies. Many-body electronic structure calculations using dynamical mean-field theory confirm the low-energy Fermi-liquid scaling, and provide quantitative understanding of the deviations from Fermi-liquid behavior at higher energy and temperature. The excess optical spectral weight in this regime provides evidence for strongly dispersing “resilient” quasiparticle excitations above the Fermi energy.

Keywords
  • Conduction electrons
  • Fermi-liquid theory and other phenomenological models
  • Relaxation times and mean free paths
  • Ruthenates
  • Raman and optical spectroscopy
Research groups
Citation (ISO format)
STRICKER, Damien et al. Optical Response of Sr2RuO4 Reveals Universal Fermi-Liquid Scaling and Quasiparticles Beyond Landau Theory. In: Physical review letters, 2014, vol. 113, n° 8, p. 087404. doi: 10.1103/PhysRevLett.113.087404
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Article (Published version)
accessLevelPublic
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Journal ISSN0031-9007
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