Three-dimensional strain state and spacer thickness-dependent properties of epitaxial Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3 trilayer structure
Three-dimensional strain state and spacer thickness-dependent properties of epitaxial Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3 trilayer structure
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DOI：
10.1063/1.4884995
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发表时间：
2014-06
影响因子：
3.2
通讯作者：
Haiou Wang;Jie Zhang;Q. Jia;F. Xu;W. Tan;D. Huo;Ju Gao
中科院分区：
文献类型：
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作者：
Haiou Wang;Jie Zhang;Q. Jia;F. Xu;W. Tan;D. Huo;Ju Gao
采用脉冲激光沉积技术在（001）取向的单晶MgO衬底上制备了由铁磁金属Pr0.7Sr0.3MnO3（PSMO）和反铁磁绝缘体La0.5Ca0.5MnO3（LCMO）组成的外延巨磁阻三层结构。研究了PSMO/LCMO/PSMO三层薄膜的三维应变状态和电、磁输运性质随LCMO间隔层厚度和晶格应变的变化规律。当LCMO间隔层的厚度为6 nm时，三层中的晶格应变开始弛豫。此外，LCMO间隔层厚度高达36 nm的三层结构并未完全实现应变弛豫。薄膜的晶胞体积不守恒，并表现出随LCMO层厚度的变化。应变弛豫状态由体应变（eB）和Jahn-Teller（eJT）应变共同决定。电和磁输运性质，包括金属-绝缘体转变温度TMI和饱和磁化强度MS，也显示出。
Epitaxial colossal magnetoresistive trilayer structures consisting of ferromagnetic metallic Pr0.7Sr0.3MnO3 (PSMO) and antiferromagnetic insulator La0.5Ca0.5MnO3 (LCMO) were fabricated on (001)-oriented single crystal MgO substrates using pulsed laser deposition technique. The evolution of three-dimensional strain states and electrical and magnetic transport properties of PSMO/LCMO/PSMO trilayers have been studied as a function of LCMO spacer thickness and lattice strain. When the thickness of LCMO spacer is 6 nm, lattice strain in the trilayer begins to be relaxed. Furthermore, trilayers with thickness of LCMO spacer up to 36 nm are not fully strain relaxation. The unit cell volume of the films is not conserved and exhibits the variation with LCMO layer thickness. Strain relaxation states are determined by bulk strain (eB) and Jahn–Teller (eJT) strain together. The electrical and magnetic transport properties, including metal-insulator transition temperatures TMI and saturation magnetization MS, also sho...