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  • Title: Magnetoelectric Coupling Induced Orbital Reconstruction and Ferromagnetic Insulating State in PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3 Heterostructures.
    Author: Liu C, Zhang B, Yu X, Wu X, Chen P, Yang P, Yu X, Ding J, Chen J, Chow GM.
    Journal: ACS Appl Mater Interfaces; 2020 Aug 05; 12(31):35588-35597. PubMed ID: 32614572.
    Abstract:
    Novel phenomena at the ferromagnetic/ferroelectric interface have generated much interest. Here, a ferromagnetic insulating state with the Curie temperature about 268-286 K in PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3 heterostructures is induced and modulated by varying the PbZr0.52Ti0.48O3 thickness. An abnormally enlarged c/a ratio in La0.67Sr0.33MnO3 by strain-based coupling effect leads to d3z2-r2 orbital preferable occupancy. This orbital reconstruction modulates effective electron transfer and finally leads to a ferromagnetic insulating state. Valence change induced by charge-based coupling effect could be partially responsible for change in the Curie temperature in the strongly correlated electron system of La1-xSrxMnO3. This work provides a deeper understanding of strain effects near the ferromagnetic/ferroelectric interface, especially in a PbZr1-yTiyO3/La1-xSrxMnO3 heterostructure system.
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