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首页> 外文期刊>Physica, B. Condensed Matter >Larmor diffraction measurement of the temperature dependence of lattice constants in CuGeO3
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Larmor diffraction measurement of the temperature dependence of lattice constants in CuGeO3

机译：拉莫尔衍射测量CuGeO3中晶格常数与温度的关系

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摘要

By using the neutron Larmor diffraction method and a setup based on the improved neutron resonant spin echo option ZETA recently installed on the three-axis spectrometer IN22 (CRG beam line at the ILL), we have determined the precise relative evolution of the inter- and intra-chain lattice constants of the paradigmatic spin-Peierls compound CuGeO_3 as a function of temperature. Our results are consistent with previous results obtained by conventional high-resolution diffraction. This method also allows to retrieve independently the sample mosaicities, as well as the widths of various lattice-spacings distributions, thus offering an evaluation of the intrinsic sample quality. In spite of the good definition of the spin-Peierls transition at T_(SP)=14.1(1) K in our sample, we observe a large distribution of lattice constants (Δd/d?3×10~(-3)), while the mosaicity of the sample appears to be quite reasonable (?20′).
机译：通过使用中子拉莫尔衍射法和基于最近安装在三轴光谱仪IN22上的改进中子共振自旋回波选件ZETA的装置（ILL处的CRG光束线），我们已经确定了内部和外部的精确相对演化。自旋Peierls化合物CuGeO_3的链内晶格常数随温度的变化。我们的结果与常规高分辨率衍射获得的先前结果一致。此方法还允许独立地检索样本镶嵌图以及各种晶格间距分布的宽度，从而提供对固有样本质量的评估。尽管在样本中T_（SP）= 14.1（1）K处自旋-Peierls跃迁定义明确，但我们观察到晶格常数分布较大（Δd/ d？3×10〜（-3）），而样品的镶嵌性似乎是相当合理的（？20'）。

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