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arXiv 1702.06302cond-mat.str-el
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纯锰氧化物-锰氧化物异质结构中的巨磁电效应

Giant magnetoelectric effect in pure manganite-manganite heterostructures

Sanjukta Paul, Ravindra Pankaj, Sudhakar Yarlagadda, Pinaki Majumdar, Peter B. Littlewood

摘要:

在大块材料和异质结构中获得强磁电耦合是一个持续的挑战。我们表明,锰氧化物异质结构的形式${\rm (Insulator)/(LaMnO_3)_n/(CaMnO_3)_n/(Insulator)}$表现出很强的多铁性磁性锰氧化物的铁电极化是通过电荷泄漏从${\rm LaMnO_3}$到${\rm CaMnO_3}$由于排斥。在这里,通过合作的电子-声子相互作用产生有效的最近邻电子-电子(电子-空穴)排斥(吸引)。双交换,当一个粒子实际上跳到它未被占据的邻近位置并返回时,产生了磁性极化子,这些极化子包围了反铁磁区域。因此,当外加电场增强了电子在界面上的泄漏时,会产生显著的巨磁电效应。

英文摘要:

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.

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