  Kondo-like effect, namely the upturn of resistivity at low temperatures, has
been observed in perovskite manganite when nonmagnetic insulators were doped as
the secondary phase. In this paper, the low-temperature resistivity upturn
effect was argued to be originated from the interfacial magnetic phase
reconstruction. Heisenberg spin lattices have been simulated using Monte Carlo
method to reveal the phase competition around the secondary phase boundary,
namely the manganite-insulator boundary behaves a weak antiferromagnetic
tendency. And the resistor-network model based on the double-exchange
conductive mechanism indeed reproduces the low-temperature resistivity upturn
effect. Our work provide a reasonable physical mechanism to understand novel
transport behaviors in micro-structures of correlated electron systems.
