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Metal-insulator transition features as a transformation, from a highly chargeconductive state to another state where charge conductivity is greatlysuppressed when decreasing the temperature. Here we demonstrate two consecutivetransitions in NdNiO3 films with CoFe2O4 capping, in which the metal-insulatortransition occurs at 85 K, followed by an unprecedented insulator-metaltransition below 40 K. The emerging insulator-metal transition associated witha weak antiferromagnetic behavior is observed in 20 unit cell-thick NdNiO3 withmore than 5 unit cell CoFe2O4 capping. Differently, the NdNiO3 films withthinner CoFe2O4 capping only exhibit metal-insulator transition at 85 K,accompanied by a strong antiferromagnetic state below 40 K. Charge transferfrom Co to Ni, instead of from Fe to Ni, formulates the ferromagneticinteraction between Ni-Ni and Ni-Co atoms, thus suppressing theantiferromagnetic feature and producing metallic conductive behavior.Furthermore, a phase diagram for the metal-insulator-metal transition in thissystem is drawn.

Metal-insulator-metal transition in NdNiO3 films capped by CoFe2O4