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Surface and bulk structural properties of single-crystalline Sr_3Ru_2O_7

机译:Sr_3Ru_2O_7单晶的表面和整体结构性质

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摘要

We report temperature and thermal-cycling dependence of surface and bulk structures of double-layered perovskite Sr_3Ru_2O_7 single crystals. The surface and bulk structures were investigated using low-energy electron diffraction (LEED) and single-crystal x-ray diffraction (XRD) techniques, respectively. Single-crystal XRD data is in good agreement with previous reports for the bulk structure with RuO_6 octahedral rotation, which increases with decreasing temperature [~6.7(6)° at 300 K and ~8.1(2)° at 90 K]. LEED results reveal that the octahedra at the surface are much more distorted with a higher rotation angle (~12° between 300 and 80 K) and a slight tilt [(4.5 ± 2.5)° at 300 K and (2.5 ± 1.7)° at 80 K]. While XRD data confirms temperature dependence of the unit-cell height/width ratio (i.e., lattice parameter c divided by the average of parameters a and b) found in a prior neutron-powder-diffraction investigation, both bulk and surface structures display little change with thermal cycles between 300 and 80 K.
机译:我们报道了双层钙钛矿Sr_3Ru_2O_7单晶的表面和整体结构的温度和热循环依赖性。分别使用低能电子衍射(LEED)和单晶X射线衍射(XRD)技术研究了表面和整体结构。对于具有RuO_6八面体旋转的整体结构,单晶XRD数据与以前的报道非常吻合,随着温度的降低[300 K时约为6.7(6)°,90 K时约为8.1(2)°]。 LEED结果表明,八面体在表面处的扭曲程度更大,旋转角度更高(300至80 K之间约为12°),并且在300 K处略有倾斜[(4.5±2.5)°,在300 K处为(2.5±1.7)° 80 K]。 XRD数据证实了先前中子-粉末衍射研究中发现的晶胞高度/宽度比的温度依赖性(即晶格参数c除以参数a和b的平均值),而体积和表面结构均显示出很小的变化热循环在300至80 K之间。

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  • 来源
    《Physical review》 |2010年第18期|P.184104.1-184104.8|共8页
  • 作者单位

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    rnDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    rnDepartment of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    rnDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    rnDepartment of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

    rnDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA;

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

    crystalline state; oxide surfaces;

    机译:结晶态氧化物表面;

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