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首页> 外文期刊>Advanced Functional Materials >A Coherently Strained Monoclinic [111]PbTiO_3 Film Exhibiting Zero Poisson's Ratio State
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A Coherently Strained Monoclinic [111]PbTiO_3 Film Exhibiting Zero Poisson's Ratio State

机译：零泊松比状态的相干应变单斜[111] PbTiO_3薄膜

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摘要

[111]-Oriented perovskite oxide films exhibit unique interfacial and symmetry breaking effects, which are promising for novel quantum materials as topological insulators and polar metals. However, due to strong polar mismatch and complex structural reconstructions on (111) surfaces/interfaces, it is still challenging to grow high quality [111] perovskite heterostructures, let alone explore the as-resultant physical properties. Here, the fabrication of ultrathin PbTiO3 films grown on a SrTiO3(111) substrate with atomically defined surfaces, by pulsed laser deposition, is reported. High-resolution scanning transmission electron microscopy and X-ray diffraction reveal that the as-grown [111]PbTiO3 films are coherent with the substrate and compressively strained along all in-plane directions. In contrast, the out-of-plane lattices are almost unchanged compared with that of bulk PbTiO3, resulting in a 4% contraction in unit cell volume and a nearly zero Poisson's ratio. Ferroelectric displacement mapping reveals a monoclinic distortion within the compressed [111]PbTiO3, with a polarization larger than 50 mu C cm(-2). The present findings, as further corroborated by phase field simulations and first principle calculations, differ significantly from the common [001]-oriented films. Fabricating oxide films through [111] epitaxy may facilitate the formation of new phase components and exploration of novel physical properties for future electronic nanodevices.
机译：[111]取向的钙钛矿氧化物薄膜表现出独特的界面和对称断裂效应，这对于作为拓扑绝缘体和极性金属的新型量子材料很有希望。然而，由于强烈的极性失配和（111）表面/界面上复杂的结构重建，要生长出高质量的[111]钙钛矿异质结构仍然是一项挑战，更不用说研究结果了。在这里，报道了通过脉冲激光沉积在具有原子限定表面的SrTiO3（111）衬底上生长的超薄PbTiO3膜的制造。高分辨率扫描透射电子显微镜和X射线衍射表明，生长中的[111] PbTiO3薄膜与基材紧密结合，并沿所有面内方向压缩应变。相反，与块状PbTiO3相比，面外晶格几乎没有变化，导致晶胞体积收缩4％，泊松比几乎为零。铁电位移映射揭示了压缩的[111] PbTiO3中的单斜应变，其极化大于50μC cm（-2）。通过相场模拟和第一原理计算进一步证实了本发现，这些发现与常见的[001]取向薄膜大不相同。通过[111]外延制造氧化膜可以促进新相成分的形成，并有助于探索未来电子纳米器件的新物理性能。

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  • 来源
    《Advanced Functional Materials》 |2019年第35期|1901687.1-1901687.10|共10页
  • 作者

    Tang Yunlong; Zhu Yinlian; Ma Xiuliang; Hong Zijian; Wang Yujia; Wang Wenyuan; Xu Yaobin; Liu Ying; Wu Bo; Chen Lang; Huang Chuanwei; Chen Longqing; Chen Zuhuang; Wu Haijun; Pennycook Stephen J.;

  • 作者单位

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China|Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Langongping Rd 287, Lanzhou 730050, Gansu, Peoples R China;

    Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China;

    Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA|South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China;

    Shenzhen Univ, Sch Mat Sci & Engn, Shenzhen 518060, Peoples R China;

    Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA|South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China;

    Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China;

    Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore;

    Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore;

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  • 正文语种 eng
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  • 关键词

    111 perovskite film; ferroelectric; monoclinic; Poisson's ratio; strain engineering;

    机译：[111] Perovskite薄膜;铁电;单斜视;泊松比;应变工程;

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