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首页> 外文期刊>Physica, B. Condensed Matter >Commensurate-incommensurate urate transition of charge density waves in o-TaS3
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Commensurate-incommensurate urate transition of charge density waves in o-TaS3

机译：o-TaS3中电荷密度波的相称到相称尿酸盐跃迁

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We report a synchrotron X-ray study of charge density waves (CDWs) in an o-TaS3 crystal. CDW of o-TaS3 has been known to undergo a commensurate-incommensurate transition at 100 K, below which the wavevector locks in with the pristine lattice. However, the details of the commensurate-incommensurate transition remain open problems, the example being whether the discommensuration exists or not in the neighborhood of the transition. We exploited the beamline BL02B1 of SPring-8. A two-dimensional detector was placed at a distance of 1300mm from the sample, providing an angle resolution of 0.0076 degrees. Temperature dependence of the Bragg peak (0 0 2) and satellite peak (1 - 12) + q was measured from 7 to 180 K. We found that a new phase in the temperature range of 130-50 K, where two independent CDWs coexist. These waves are incommensurate and commensurate CDWs with longitudinal wave vectors q(c) = 0.252c* and 0.250c*, respectively. By lowering the temperature, intensity of the incommensurate CDW was decreased, while that of the commensurate CDW was increased. Below 50K, the incommensurate CDW was completely diminished. Based on the concept of discommensuration, we suggested the dislocation configuration from the intensity of the two CDWs.
机译：我们报告了o-TaS3晶体中电荷密度波（CDWs）的同步加速器X射线研究。已知o-TaS3的CDW在100 K处经历了相称到相称的跃迁，在该跃迁以下，波矢被原始晶格锁定。但是，相称到相称过渡的细节仍然是未解决的问题，例如，在过渡附近是否存在不相称。我们利用了SPring-8的光束线BL02B1。将二维检测器放置在距离样品1300mm的位置，以提供0.0076度的角度分辨率。布拉格峰（0 0 2）和卫星峰（1-12）+ q的温度依赖性在7至180 K之间测量。我们发现，在130至50 K的温度范围内有一个新相，其中两个独立的CDW共存。这些波分别是不相称的和相称的CDW，其纵向波矢q（c）= 0.252c *和0.250c *。通过降低温度，不相称的CDW的强度降低，而相称的CDW的强度提高。低于50K，不合理的CDW被完全消除。基于不均衡的概念，我们从两个CDW的强度提出了位错配置。

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