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Strain-Mediated Inverse Photoresistivity in SrRuO3/La0.7Sr0.3MnO3 Superlattices

机译:SrRuO3 / La0.7Sr0.3MnO3超晶格中的应变介导的逆光致电阻率

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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.
机译:为了通过利用复杂氧化物异质结构中的晶格自由度来追求新颖的功能,通过跨界面的直接应变操纵的控制机制仍在开发中,尤其是在各种刺激下,例如电场,磁场,光等。在这项研究中,已设计了由巨磁阻锰矿La0.7Sr0.3MnO3(LSMO)和光致伸缩SrRuO3(SRO)组成的超晶格,以研究相应功能和丰富的界面物理学中晶格顺序的光依赖性可控性。已经采用两种衬底SrTiO3(STO)和LaAlO3(LAO)为超晶格系统提供不同的应变环境,其中LSMO子层表现出不同的轨道占据。随后,通过引入光,我们可以通过光诱导SRO子层的膨胀来调节LSMO子层的应变状态和轨道优先级,从而导致令人惊讶地相反的光刻胶变化。在光照下,观察到的光阻系数在STO衬底上生长的超晶格中减小,而在LAO衬底上生长的超晶格中则增大。这项工作提出了一个模型系统,该模型系统演示了通过光刺激来操纵轨道-晶格耦合以及在人造氧化物超晶格中所产生的功能。

著录项

  • 来源
    《Advanced Functional Materials》 |2016年第5期|729-737|共9页
  • 作者单位

    Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan;

    King Abdullah Univ Sci & Technol, Comp Elect & Math Sci & Engn Div, Thuwal 239556900, Saudi Arabia;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China;

    Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan;

    Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan;

    Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China;

    Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan;

    Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China|Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China|Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China;

    King Abdullah Univ Sci & Technol, Comp Elect & Math Sci & Engn Div, Thuwal 239556900, Saudi Arabia;

    Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan|Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30010, Taiwan|Acad Sinica, Inst Phys, Taipei 11529, Taiwan;

    Univ Durham, Dept Phys, Durham DH1 3LE, England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    manganites (La0; 7Sr0; 3MnO(3)); orbital occupancy; photoresistivity; strontium ruthenate (SrRuO3); superlattices;

    机译:锰酸盐(La0;7Sr0;3MnO(3));轨道占有率;光阻性;钌酸锶(SrRuO3);超晶格;

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