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Title

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

Authors
Mravlje, J.
Fittipaldi, R.
Vecchione, A.
Published in Physical Review Letters. 2014, vol. 113, no. 8, p. 087404
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 electronsFermi-liquid theory and other phenomenological modelsRelaxation times and mean free pathsRuthenatesRaman and optical spectroscopy
Identifiers
arXiv: 1403.5445
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Structures
Research group Groupe Van der Marel
Projects FNS: 200020-140761
FNS: 200021-146586
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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. https://archive-ouverte.unige.ch/unige:39703

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Deposited on : 2014-08-25

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