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首页> 外文期刊>Physical review >Erratum: Direct measurement of spin correlations using magnetostriction [Phys. Rev. B 77,020404(R) (2008)]
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Erratum: Direct measurement of spin correlations using magnetostriction [Phys. Rev. B 77,020404(R) (2008)]

机译：勘误：使用磁致伸缩技术直接测量自旋相关性[Phys。 B版77,020404（R）（2008）]

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摘要

We discovered a non-negligible systematic error in the measurements of the magnetostriction along the crystallo-graphic a axis (H || c,L || a) in NiCl_2-4SC(NH_2)_2 (DTN). It turned out that the measurements performed at the National High Magnetic Field Laboratory in Tallahassee, Florida, with a capacitive dilatometer were accompanied by a significant magnetic torque effect due to motion of the screw on which the sample sits, which dominated the experimental results. In Fig. 1, the correct data (black curve) taken with a second dilatometer cell at the Max Planck-Institute in Dresden, Germany, for 60 mK tem perature in magnetic fields up to 10 T are shown in comparison with the incorrect data previously taken at 42 mK (red dashed line). We also checked the exper imental results along the other crystallographic direction (H || c || L) in the Tallahassee cell for the same sam ple, with the torque problem corrected, and with a dif ferent sample of DTN in Dresden. All the data agree, so the original (H || c || L) data are correct. These re sults are also displayed in Fig. 1, where the origi nal data (blue line at 27 mK) is compared to Dres den data (green crosses at 93 mK) in magnetic fields up to 4 T. We confirmed by measurements performed at different temperatures (data not shown) that the magne tostriction versus magnetic field does not change much below 100 mK and that the comparison of the data is appropriate.
机译：我们发现在NiCl_2-4SC（NH_2）_2（DTN）中沿晶体图a轴（H || c，L || a）的磁致伸缩测量中的系统误差是不可忽略的。事实证明，在佛罗里达州塔拉哈西市的国家高磁场实验室，使用电容式膨胀计进行的测量由于样品所处螺钉的运动而伴随着显着的磁转矩效应，从而支配了实验结果。在图1中，显示了在德国德累斯顿马克斯普朗克研究所用第二个膨胀计单元获得的正确数据（黑色曲线），该数据是在最高10 T的磁场中温度为60 mK的情况下与先前的错误数据进行比较的结果在42 mK（红色虚线）处拍摄。我们还检查了相同样品的Tallahassee电池沿另一个晶体学方向（H || c || L）的实验结果，校正了扭矩问题，并在德累斯顿使用了不同的DTN样品。所有数据都一致，因此原始（H || c || L）数据是正确的。这些结果也显示在图1中，其中原始数据（27 mK处的蓝线）与Dres den数据（93 mK处的绿色叉号）在高达4 T的磁场中进行了比较。我们通过在不同的温度（数据未显示）表明，在100 mK以下，磁致伸缩率与磁场的变化不大，并且比较数据是适当的。

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