Magnetism and Superconductivity in LCMO/YBCO bilayers

超导性描述了电可以无电阻流动的现象，它出现在各种材料中，但通常只在非常低的温度下。即使是所谓的高温超导体，在开始超导之前也需要冷却，例如用液氮冷却。然而，这些20多年前首次发现的高温超导体继续引起我们的兴趣。特别是，人们认为，如果我们能够理解为什么这些材料超导，那么有一天可能设计出一种在室温下超导的材料。然而，没有这样的理论被接受。最有趣的事情之一是超导状态与磁性的密切关系，许多人认为磁性可能是将超导电子结合在一起的粘合剂。磁性与超导性的相互作用可以通过在彼此顶部生长超导层和铁磁层的薄膜来迫使磁性和超导结构在一起来有效地研究。然后，可以通过各种技术来研究一个对另一个的相互作用和影响，其中之一是通过观察X射线如何根据样品中的磁性被吸收。同步加速器是一种产生强烈X射线的设备，这些射线反过来可以用于探测材料。目前的建议是为一项在日本同步加速器（称为SPring-8）上进行的经过同行评审的束流时间实验寻求资金，并访问京都大学物理系，达格代尔应邀在那里举行研讨会，以建立合作联系。

Superconductivity, which describes the phenomenon whereby electricity can flow without resistance, occurs in a wide range of materials, but normally only at very low temperatures. Even the so-called high-temperature superconductors need to be cooled down, for example with liquid nitrogen, before they start to superconduct. However, these high-temperature superconductors, first discovered more than 20 years ago, continue to intrigue us. In particular, it is thought that if we can understand why these materials superconduct then it might be possible one day to design a material which will superconduct at room temperature. However, no such theory has been accepted. One of the most intriguing things is the close-relationship of the superconducting state to magnetism, and many believe that magnetism might be the glue that bindsthe superconducting electrons together. The interaction of magnetism with superconductivity can usefully be investigated by forcing magnetic and superconducting structures together by growing thin films of superconducting and ferromagnetic layers on top of each other. Then the interactions and effects of one on the other can be studied by various techniques, one of which is by looking at how x-rays are absorbed depending on the magnetism in the sample.A synchrotron is a device for producing intense x-rays which can in turn be used to probe materials. The current proposal seeks funding for an experiment which has been given peer-reviewed beamtime at a synchrotron in Japan (called SPring-8), and also to visit the Department of Physics at the University of Kyoto, where Dugdale has been invited to give a seminar, in order to develop collaborative links.