霍尔效应测量中的不等位热扩散电势差
DIFFERENCE FROM UNEQUAL POTENTIAL OF THERMAL DIFFUSION CURRENT IN THE MEASUREMENT ON HALL EFFECT
李潮锐
摘要(Abstract):
尽管常规换向直流法可消除已知副效应干扰并得到霍尔电压,但它掩盖了存在未知附加电势的实验事实。将4次换向测量归纳为磁场与样品电流同相组合和反相组合,根据在磁场中样品电流和热扩散电流具有相似物理行为,必须考虑不等位热扩散电势差的影响。这一方案不仅更清晰地解释4次换向测量平均的物理原理,还通过同相测量平均和反相测量平均之差与和得到不等位热扩散电势差与确定且可重复的霍尔电压。实验事实及分析结果表明,引入不等位热扩散电势差才能完整描述霍尔测量中所有副效应的贡献。
关键词(KeyWords): 霍尔效应;副效应;不等位电势;热扩散电流
基金项目(Foundation): 国家自然科学基金(61975244);; 中山大学2022年度教学质量与教学改革工程项目(教务[2022]91号)
作者(Author): 李潮锐
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