2017/02/21 by Sanjukta Paul, Ravindra Pankaj, Paul, Sanjukta +8
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1702.06302
This version supersedes arXiv:1203.3283
arxiv created 2017/02/21 · openalex publication_date 2017/02/21 · arxiv updated 2017/02/22 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28
Obtaining strong magnetoelectric couplings in bulk materials and heterostructures is an ongoing challenge. We demonstrate that manganite heterostructures of the form \rm (Insulator)/(LaMnO3)n/(CaMnO3)n/(Insulator) show strong multiferroicity in magnetic manganites where ferroelectric polarization is realized by charges leaking from \rm LaMnO3 to \rm CaMnO3 due to repulsion. Here, an effective nearest-neighbor electron-electron (electron-hole) repulsion (attraction) is generated by cooperative electron-phonon interaction. Double exchange, when a particle virtually hops to its unoccupied neighboring site and back, produces magnetic polarons that polarize antiferromagnetic regions. Thus a striking giant magnetoelectric effect ensues when an external electrical field enhances the electron leakage across the interface.