Evidence for resonant scattering of electrons by spin fluctuations in LaNiO₃/LaAlO₃ heterostructures grown by pulsed laser deposition

We present measurements of resistivity $\rho$ in highly oriented $LaNiO_3$ films grown on $LaAlO_3$ substrates by using a pulsed laser deposition technique. The experimental data are found to follow a universal $\rho (T) \propto T^{3/2}$ dependence for the entire temperature interval ($20K<T<300K$). The observed behavior has been attributed to a resonant scattering of electrons on antiferromagnetic fluctuations (with a characteristic energy $\hbar \omega _{sf}\simeq 2.1meV$) triggered by spin-density wave propagating through the interface boundary of $LaNiO_3/LaAlO_3$ sandwich.