Low-temperature electronic properties of a normal conducting perovskite oxide (LaNiO₃)

Abstract

We report here the measurements of specific heat (10 K>T>1.5 K), thermopower (300 K>T>4 K), electrical conductivity (300 K>T>0.4 K) and tunneling conductance (T=4.2 K) of the perovskite oxide metal LaNiO₃. We show that this oxide metal has a fairly large electron-electron interaction which gives rise to a T^½ correction to the conductivity for T<2 K and a V^½ correction to the single particle density of states near the Fermi energy. The strong interaction effects in this metal arise from the low electron diffusivity.