Effect of structural and magnetic exchange coupling on the electronic transport of NdNiO_3 films intercalated with La_(0.7)Sr_(0.3)MnO_3 thin layers

摘要

We have fabricated multilayer structure of half-metallic ferromagnet La_(0.7)Sr_(0.3)MnO_3 and insulator-metal transition system NdNiO_3 on SrTiO_3 (100) substrate; thin layers of the former are intercalated in the major matrix of the later. The two structures exhibit pseudomorphic structural coupling with each other. We show that a large increase in the conductivity and an enhanced irreversibility across insulator-metal transition of NdNiO_3 may be realized by varying the thickness of La_(0.7)Sr_(0.3)MnO_3 and the ratio of thickness of the two layers. Corroborated by the magnetization data, it is shown that the combined effect of structure and magnetism by interfacial coupling is a much better technique than the chemical modification to control the electrical transport of NdNiO_3.