Giant magnetoelectric effect in pure manganite-manganite heterostructures

Autor:	Paul, Sanjukta, Pankaj, Ravindra, Yarlagadda, Sudhakar, Majumdar, Pinaki, Littlewood, Peter B.
Rok vydání:	2017
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	Obtaining strong magnetoelectric couplings in bulk materials and heterostructures is an ongoing challenge. We demonstrate that manganite heterostructures of the form ${\rm (Insulator)/(LaMnO_3)_n/(CaMnO_3)_n/(Insulator)}$ show strong multiferroicity in magnetic manganites where ferroelectric polarization is realized by charges leaking from ${\rm LaMnO_3}$ to ${\rm CaMnO_3}$ 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. Comment: This version supersedes arXiv:1203.3283
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1702.06302 Zobrazit plný text záznamu View this record from Arxiv