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首页> 外文期刊>Advanced Functional Materials >Polar Cation Ordering: A Route to Introducing ＞10% Bond Strain Into Layered Oxide Films
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Polar Cation Ordering: A Route to Introducing ＞10% Bond Strain Into Layered Oxide Films

机译：极性阳离子有序化：向层状氧化膜中引入＞ 10％键应变的途径

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摘要

The 3d transition metal (M) perovskite oxides exhibit a remarkable array of properties, including novel forms of superconductivity, magnetism and multi-ferroicity. Strain can have a profound effect on many of these properties. This is due to the localized nature of the M 3d orbitals, where even small changes in the M-O bond lengths and M-O-M bond angles produced by strain can be used to tune the 3d- O 2p hybridization, creating large changes in electronic structure. A new route is presented to strain the M-O bonds in epitaxial two-dimensional perovskite films by tailoring local electrostatic dipolar interactions within every formula unit via atomic layer-by-layer synthesis. The response of the O anions to the resulting dipole electric fields distorts the M-O bonds by more than 10%, without changing substrate strain or chemical composition. This distortion is largest for the apical oxygen atoms (O_(ap)), and alters the transition metal valence state via self-doping without chemical substitution.
机译：3d过渡金属（M）钙钛矿氧化物表现出显着的性能，包括超导性，磁性和多铁性的新型形式。应变可以对许多这些特性产生深远的影响。这是由于M 3d轨道的局部性质所致，其中应变产生的M-O键长和M-O-M键角即使很小的变化也可以用来调节3d-O 2p杂交，从而在电子结构中产生大的变化。提出了一种新的途径，通过原子逐层合成在每个分子式单元内调整局部静电偶极相互作用，从而使外延二维钙钛矿薄膜中的M-O键应变。 O阴离子对产生的偶极电场的响应会使M-O键变形超过10％，而不会改变底物应变或化学成分。这种畸变对于顶端的氧原子（O_（ap））最大，并通过自掺杂改变过渡金属化合价态而没有化学取代。

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  • 来源
    《Advanced Functional Materials》 |2014年第43期|6884-6891|共8页
  • 作者

    Brittany B. Nelson-Cheeseman; Hua Zhou; Prasanna V. Balachandran; Gilberto Fabbris; Jason Hoffman; Daniel Haskel; James M. Rondinelli; Anand Bhattacharya;

  • 作者单位

    Materials Science Division Argonne National Lab Argonne, IL 60439, USA,School of Engineering University of St. Thomas St. Paul, MN 55105, USA;

    Advanced Photon Source Argonne National Lab Argonne, IL 60439, USA;

    Dept of Materials Science and Engineering Drexel University Philadelphia, PA 19104, USA;

    Advanced Photon Source Argonne National Lab Argonne, IL 60439, USA,Department of Physics Washington University St. Louis, MO 60130, USA;

    Materials Science Division Argonne National Lab Argonne, IL 60439, USA;

    Advanced Photon Source Argonne National Lab Argonne, IL 60439, USA;

    Dept of Materials Science and Engineering Drexel University Philadelphia, PA 19104, USA,Department of Materials Science and Engineering Northwestern University, Evanston, IL 60208, USA;

    Materials Science Division Argonne National Lab Argonne, IL 60439, USA,Center for Nanoscale Materials Argonne National Lab Argonne, IL 60439, USA;

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