Noise Investigations of Condensed Matter Systems

大多数材料表现出缓慢的波动， 特征率的分布，在各种电气， 机械、磁性和光学参数。 尽管 频谱的简单形式（1/f）的普遍性 这种波动，涉及各种各样的机制， 在过去的实验中得到了证实。 这些波动 出于两个一般原因而感兴趣。 首先，他们限制了 各种传感器和设备的性能。 二是 提供了一个有用的工具来研究的基本性质 材料，特别是对材料类型知之甚少 被称为玻璃，它表现出部分冻结的随机 结构. 他们利用电、光和磁 研究普通玻璃的波动技术 金属，自旋玻璃，随机畴磁性材料 结构和其他系统。 他们特别关注的是 冻结的随机结构从流体随机结构中出现， 温度降低，以及保持什么类型的解冻模式 在非常低的温度下。

Most materials exhibit slow fluctuations, with a broad distribution of characteristic rates, in a variety of electrical, mechanical, magnetic, and optical parameters. Despite the ubiquity of a simple form (1/f) for the frequency spectrum of such fluctuations, a wide variety of mechanisms are involved, as has been demonstrated in past experiments. These fluctuations are of interest for two general reasons. First, they limit the performance of a variety of sensors and devices. Second, they provide a useful tool to study fundamental properties of materials, especially the poorly understood types of materials known as glasses, which exhibit partially frozen random structures. They are using electrical, optical and magnetic fluctuation techniques to investigate ordinary glasses, glassy metals, spin glasses, magnetic materials with random domain structures, and other systems. Their particular focus is on how frozen random structures emerge from fluid random structures as temperature is lowered, and on what type of unfrozen modes remain at very low temperatures.