Low-Temperature Dependence of the Shear Viscosity in Superconductor S r 2 R u O 4

Abstract

Low-temperature dependence of the shear viscosity components in superconductor Sr2RuO4 is investigated within the framework of the Boltzmann equation. We will show that this dissipative viscosity has a power-law temperature dependence as T2 for the γ band of the Fermi surface with the isotropic gap. Lupien et al. experimentally found that the shear viscosity components of superconductor Sr2RuO4 change as T1.8 at low temperatures. This relative consistency between the temperature dependence for the isotropic gap and experimental results implies that the gap node of Sr2RuO4 may be a horizontal line node.