標題: Strain-Mediated Inverse Photoresistivity in SrRuO3/La0.7Sr0.3MnO3 Superlattices
作者: Liu, Heng-Jui
Wei, Tzu-Chiao
Zhu, Yuan-Min
Liu, Rui-Rui
Tzeng, Wen-Yen
Tsai, Chih-Ya
Zhan, Qian
Luo, Chih-Wei
Yu, Pu
He, Jr-Hau
Chu, Ying-Hao
He, Qing
材料科學與工程學系
電子物理學系
Department of Materials Science and Engineering
Department of Electrophysics
關鍵字: manganites (La0;7Sr0;3MnO(3));orbital occupancy;photoresistivity;strontium ruthenate (SrRuO3);superlattices
公開日期: 2-Feb-2016
摘要: In the pursuit of novel functionalities by utilizing the lattice degree of freedom in complex oxide heterostructure, the control mechanism through direct strain manipulation across the interfaces is still under development, especially with various stimuli, such as electric field, magnetic field, light, etc. In this study, the superlattices consisting of colossal-magnetoresistive manganites La0.7Sr0.3MnO3 (LSMO) and photostrictive SrRuO3 (SRO) have been designed to investigate the light-dependent controllability of lattice order in the corresponding functionalities and rich interface physics. Two substrates, SrTiO3 (STO) and LaAlO3 (LAO), have been employed to provide the different strain environments to the superlattice system, in which the LSMO sublayers exhibit different orbital occupations. Subsequently, by introducing light, we can modulate the strain state and orbital preference of LSMO sublayers through light-induced expansion of SRO sublayers, leading to surprisingly opposite changes in photoresistivity. The observed photoresistivity decreases in the superlattice grown on STO substrate while increases in the superlattice grown on LAO substrate under light illumination. This work has presented a model system that demonstrates the manipulation of orbital-lattice coupling and the resultant functionalities in artificial oxide superlattices via light stimulus.
URI: http://dx.doi.org/10.1002/adfm.201503912
http://hdl.handle.net/11536/132774
ISSN: 1616-301X
DOI: 10.1002/adfm.201503912
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 26
Issue: 5
起始頁: 729
結束頁: 737
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