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Kondo-like effect, namely the upturn of resistivity at low temperatures, hasbeen observed in perovskite manganite when nonmagnetic insulators were doped asthe secondary phase. In this paper, the low-temperature resistivity upturneffect was argued to be originated from the interfacial magnetic phasereconstruction. Heisenberg spin lattices have been simulated using Monte Carlomethod to reveal the phase competition around the secondary phase boundary,namely the manganite-insulator boundary behaves a weak antiferromagnetictendency. And the resistor-network model based on the double-exchangeconductive mechanism indeed reproduces the low-temperature resistivity upturneffect. Our work provide a reasonable physical mechanism to understand noveltransport behaviors in micro-structures of correlated electron systems.

Interfacial Phase Competition Induced Kondo-like Effect in Manganite-insulator Composites