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Local structural displacements across the structural phase transition in IrTe_2: Order-disorder of dimers and role of Ir-Te correlations

机译:IrTe_2中整个结构相变的局部结构位移:二聚体的有序无序和Ir-Te相关性的作用

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摘要

We have studied local structure of IrTe_2 by Ir L_3-edge extended x-ray absorption fine structure (EXAFS) measurements as a function of temperature to investigate origin of the observed structural phase transition at T, ~ 270 K. The EXAFS results show an appearance of longer Ir-Te bond length (ΔR ~ 0.05 A) at T < T_s,. We have found Ir-Ir dimerization, characterized by distinct Ir-Ir bond lengths (ΔR ~ 0.13 A), existing both above and below T_s. The results suggest that the phase transition in IrTe_2 should be an order-disorder-like transition of Ir-Ir dimers assisted by Ir-Te bond correlations, thus indicating important role of the interaction between the Ir 5d and Te 5p orbitals in this transition.
机译:我们已通过Ir L_3-edge扩展x射线吸收精细结构(EXAFS)测量研究了IrTe_2的局部结构与温度的关系,以研究观察到的在T〜270 K处的结构相变的起源。EXAFS结果显示出在T <T_s时,具有更长的Ir-Te键长度(ΔR〜0.05 A)。我们发现,Ir-Ir二聚体的特征是在T_s的上方和下方均存在不同的Ir-Ir键长(ΔR〜0.13 A)。结果表明,IrTe_2中的相变应为Ir-Te键相关性辅助的Ir-Ir二聚体的有序无序转变,因此表明Ir 5d和Te 5p轨道之间的相互作用在此过渡中起重要作用。

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  • 来源
    《Physical review》 |2013年第22期|224109.1-224109.4|共4页
  • 作者单位

    Dipartimento di Fisica, Universitd di Roma 'La Sapienza' - P. le Aldo Mow 2, 00185 Roma, Italy;

    Dipartimento di Fisica, Universitd di Roma 'La Sapienza' - P. le Aldo Mow 2, 00185 Roma, Italy;

    European Synchrotron Radiation Facility, BP220, F-38043 Grenoble Cedex, France;

    Dipartimento di Fisica, Universitd di Roma 'La Sapienza' - P. le Aldo Mow 2, 00185 Roma, Italy;

    Department of Physics, Okayama University, Kita-ku, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Kita-ku, Okayama 700-8530, Japan;

    Department of Physics, Okayama University, Kita-ku, Okayama 700-8530, Japan;

    Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8561, Japan;

    Dipartimento di Fisica, Universitd di Roma 'La Sapienza' - P. le Aldo Mow 2, 00185 Roma, Italy;

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  • 正文语种 eng
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  • 关键词

    inhomogeneous superconductors and superconducting systems; effects of material synthesis, crystal structure, and chemicalrncomposition;

    机译:不均匀的超导体和超导系统;材料合成;晶体结构和化学成分的影响;

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