Tuning the dead-layer behavior of La 0.67 Sr 0.33 MnO 3 /SrTiO 3 via interfacial engineering

作者：Rui Peng, Haichao Xu, Mingxu Xia, J. F. Zhao, Xin Xie, Dan Xu, B. P. Xie, D. L. Feng · 发表于：Applied Physics Letters · 年份：2014 · DOI：10.1063/1.4866461 · 被引用次数：55 · 研究领域：Magnetic and transport properties of perovskites and related materials、Electronic and Structural Properties of Oxides、Advanced Condensed Matter Physics

The dead-layer behavior, deterioration of the bulk properties in near-interface layers, restricts the applications of many oxide heterostructures. We present the systematic study of the dead-layer in La0.67Sr0.33MnO3/SrTiO3 grown by ozone-assisted molecular beam epitaxy. Dead-layer behavior is systematically tuned by varying the interfacial doping, while unchanged with varied doping at any other atomic layers. In situ photoemission and low energy electron diffraction measurements suggest intrinsic oxygen vacancies at the surface of ultra-thin La0.67Sr0.33MnO3, which are more concentrated in thinner films. Our results show correlation between interfacial doping, oxygen vacancies, and the dead-layer, which can be explained by a simplified electrostatic model.