Megagauss sensors
Megagauss sensors
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DOI：
10.1038/417421a
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发表时间：
2002-05-23
期刊：
影响因子：
64.8
通讯作者：
Saboungi, ML
中科院分区：
文献类型：
--
作者：
Husmann, A;Betts, JB;Saboungi, ML
磁场改变了电子在固体中运动的方式。这些变化的性质揭示了材料电子结构的信息，在有利的情况下，可以用于应用。银硫族化合物，Ag2Se和Ag2Te，是非磁性材料，但是通过添加少量多余的银——仅仅是万分之一——可以使它们的电阻对磁场非常敏感（1-4）。在这里，我们表明，Ag2Se的电阻显示出一个大的，几乎线性的增加，外加磁场不饱和，最高可用的磁场，600,000高斯，超过一百万倍的地球磁场。这些在大的自然场范围内的大（数千%）和近线性响应的特性使硫属银作为磁场传感器具有吸引力，特别是在物理上微小的兆高斯（10(6)G）脉冲磁体中，已经产生了大的磁场，但精确的校准被证明是难以捉摸的。低温下的高场研究揭示了磁电阻的振荡和普遍的缩放形式，指出了这种材料前所未有的行为的量子起源（5,6）。
Magnetic fields change the way that electrons move through solids. The nature of these changes reveals information about the electronic structure of a material and, in auspicious circumstances, can be harnessed for applications. The silver chalcogenides, Ag2Se and Ag2Te, are non-magnetic materials, but their electrical resistance can be made very sensitive to magnetic field by adding small amounts-just 1 part in 10, 000-of excess silver(1-4). Here we show that the resistance of Ag2Se displays a large, nearly linear increase with applied magnetic field without saturation to the highest fields available, 600,000 gauss, more than a million times the Earth's magnetic field. These characteristics of large (thousands of per cent) and near-linear response over a large letters to nature field range make the silver chalcogenides attractive as magnetic-field sensors, especially in physically tiny megagauss (10(6) G) pulsed magnets where large fields have been produced but accurate calibration has proved elusive. High-field studies at low temperatures reveal both oscillations in the magnetoresistance and a universal scaling form that point to a quantum origin(5,6) for this material's unprecedented behaviour.