We report optical measurements demonstrating that the low-energy relaxation rate (1/tau) of the conduction electrons in Sr2RuO4 obeys scaling relations for its frequency (omega) and temperature (T) dependence in accordance with Fermi-liquid theory. In the thermal relaxation regime, 1/tau proportional to ((h) over bar omega)(2) + (p pi k(B)T)(2) with p = 2, and omega/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.
Optical Response of Sr2RuO4 Reveals Universal Fermi-Liquid Scaling and Quasiparticles Beyond Landau Theory
Fittipaldi R;Vecchione A;
2014
Abstract
We report optical measurements demonstrating that the low-energy relaxation rate (1/tau) of the conduction electrons in Sr2RuO4 obeys scaling relations for its frequency (omega) and temperature (T) dependence in accordance with Fermi-liquid theory. In the thermal relaxation regime, 1/tau proportional to ((h) over bar omega)(2) + (p pi k(B)T)(2) with p = 2, and omega/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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
