Resistivity measurements with samples in the form of a double cross
Resistivity measurements with samples in the form of a double cross
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使用双十字形式的样品进行电阻率测量
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
G. Fischer
中科院分区：
文献类型：
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作者：
S. Jandl;K. Usadel;G. Fischer
从理论上和流变学上分析了双十字形样品的电阻率测量适用性。它被发现，提供一定的几何限制观察到的，而不是真正的点接触的存在下，横向臂观察到的电阻的影响很小。通常，在具有主样品体一半横截面且间隔八个样品宽度的侧臂末端之间测量的电压仅比放置在主样品体上的类似间隔的两个点触点之间的电压低1%。对于已知的尺寸，严格计算侧臂的影响。与测量结果非常一致。流变实验还表明，只要电流臂和电压臂的宽度足够大，电流臂和电压臂的长度只需增加到原来的2 ~ 3倍，就能保证计算的正确性。
Samples in the shape of a double cross are analyzed, both theoretically and rheographically, as to their suitability for resistivity measurements. It is found, provided certain geometrical limitations are observed, that the presence of lateral arms instead of true point contacts has very little effect on the resistance observed. Typically, the voltage measured between the ends of lateral arms with half the cross section of the main sample body and separated by eight sample widths, is only 1% less than the voltage between two point contacts of similar separation placed on the main sample body. For known dimensions the effect of the side arms is calculated rigorously. Excellent agreement is found with measurements. The rheographic experiments also show that current and voltage arms need only be two or three times as long as they are wide to ensure the validity of the calculation.