Giant electron-electron scattering in the Fermi-liquid state of Na_0.7CoO_2

S. Y. Li, Louis Taillefer, D. G. Hawthorn +6

The in-plane resistivity, rho, and thermal conductivity, kappa, of a single crystal of Na_0.7CoO_2 were measured down to 40 mK. Verification of the Wiedemann-Franz law, kappa/T = L…