Lattice dynamics study of the structural transition in IrTe2
Lattice dynamics study of the structural transition in IrTe2
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DOI：
10.1080/14786435.2013.855333
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发表时间：
2014-01
影响因子：
1.6
通讯作者：
Lei Zhang;Xiangde Zhu;L. Ling;Changjin Zhang;L. Pi;Yuheng Zhang
中科院分区：
文献类型：
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作者：
Lei Zhang;Xiangde Zhu;L. Ling;Changjin Zhang;L. Pi;Yuheng Zhang
在这项工作中，我们进行了系统的研究晶格动力学的IrTe使用温度依赖性的X射线衍射实验。发现在低于相变温度（）时，IrTe的晶格结构对称性由三角晶系（空间群）转变为单斜晶系（）。值得注意的是，实验结果表明，三角形晶胞仍然坚持以下，这与单斜晶胞本质共存。相变后，单斜晶胞的比例几乎保持不变。由冷却和升温确定的结构相变温度分别为240 K和265 K。此外，超晶格相被发现与13.5，这被认为是由聚合的Te-Te键的不稳定引起的。
In this work, we perform a systematic study of the lattice dynamics of IrTe using temperature dependence of X-ray diffraction experiment. It is found that the lattice structural symmetry of IrTe changes from trigonal (space group ) into monoclinic () below the phase transition temperature (). Remarkably, experimental results show that the trigonal cell still insists below , which coexists intrinsically with the monoclinic cell. After the phase transition, the proportion of the monoclinic cell almost remains unchanged. The structure phase transition temperatures determined from cooling and warming are 240 K and 265 K, respectively. Moreover, the superlattice phase is found with 13.5 , which is suggested to be caused by the destabilization of polymeric Te–Te bonds.