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The Poisson Ratio in CoFe_2O_4 Spinel Thin Films

机译：CoFe_2O_4尖晶石薄膜的泊松比

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摘要

The response of epitaxial CoFe_2O_4 thin films to biaxial compressive stress imposed by MgAl_2O_4 and SrTiO_3 single crystalline substrates is studied using X-ray diffraction and Raman spectroscopy. It is found that the Poisson ratio v signals a non-auxetic behavior and depends on the substrate used. The Raman modes show an increase in frequency when increasing compressive strain by reducing film thickness; this is due to the shrinking of the unit cell volume. Such behavior is in qualitative agreement with recent ab initio calculations, although the measured values are significantly smaller than predictions. In contrast, the measured Poisson ratio is found to be in good agreement with expectations based on general arguments of atomic packing density. Possible guidelines for searching auxetic response in materials with spinel structure are discussed.
机译：利用X射线衍射和拉曼光谱研究了外延CoFe_2O_4薄膜对MgAl_2O_4和SrTiO_3单晶衬底施加的双轴压缩应力的响应。已经发现，泊松比v表示非膨胀行为，并且取决于所用的基材。拉曼模式通过减小膜厚来增加压缩应变时，频率会增加。这是由于晶胞体积的缩小。尽管测量值明显小于预测值，但这种行为与最近的从头算起在质量上一致。相反，基于原子堆积密度的一般论点，发现测得的泊松比与期望值非常一致。讨论了在具有尖晶石结构的材料中搜索拉力响应的可能准则。

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  • 来源
    《Advanced Functional Materials》 |2012年第20期|p.4344-4351|共8页
  • 作者

    Michael Foerster; Milko Iliev; Nico Dix; Xavier Marti; Mykhailo Barchuk; Florencio Sanchez; Josep Fontcuberta;

  • 作者单位

    Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain,Institut fuer Physik Johannes Gutenberg-Universitaet Mainz Staudinger Weg 7, 55099 Mainz, Germany;

    Texas Center for Superconductivity and Department of Physics University of Houston Houston, TX 77204-5002, USA;

    Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain;

    Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 5, 121 16 Prague 2, Czech Republic;

    Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 5, 121 16 Prague 2, Czech Republic;

    Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain;

    Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain;

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