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).