Novel Multifunctional Properties Induced by Interface Effects in Perovskite Oxide Heterostructures*

Multilayers may lead to interesting artificial materials with novel properties. In this meeting we will show that the introducing of interfaces into perovskite oxides can induce a series of novel properties including an unusual positive magnetoresistance, great enhancement of lateral photovoltage in La$_{0.9}$Sr$_{0.1}$MnO$_{3}$/SrNb$_{0.01}$Ti$_{0.99}$O$_{3}$, and an electrical-modulation of the magnetoresistance in multi-$p-n$ heterostructures of SrTiO$_{3-\delta }$/La$_{0.9}$Sr$_{0.1}$MnO$_{3}$/SrTiO$_{3-\delta }$/La$_{0.9}$Sr$_{0.1}$MnO$_{3}$/Si. The novel positive magnetoresistance is attributed to the creation of a space charge region at the interface where the spin of carriers is anti-parallel with the spin of carriers in the region far from the interface of manganese oxide in the heterostructures [1]. \\[4pt] [1] Kui-juan Jin, Hui-bin Lu, Kun Zhao, Chen Ge, Meng He, and Guo-zhen Yang, Adv. Matter. 21, (2009 in press).