Core/Shell cobaltate NPs and low field MR

Low-Field Magnetoresistance Effect in Core–Shell Structured La 0.7 Sr 0.3 CoO 3 Nanoparticles.
Yang Wang and Hong Jin Fan
Small Early view (2012)

Logarithmic conductance as a function of T ^1/2 for the core–shell nanoparticles. Inset: sketch of the spin-polarized tunneling between two neighboring core–shell particles where the shells act as a tunneling barrier.