GOALI: Strain Effects in Colossal Magnetoresistance Manganites

这是由材料研究部和多学科活动办公室资助的工业学术联络资助机会（GOALI）计划下的一个奖项。为研究巨磁阻（CMR）锰矿石的材料性能与物理性能之间的关系提供了支持。重点将放在应变如何影响材料性能上。这项研究将由约翰霍普金斯大学和朗讯科技的贝尔实验室合作完成。理论研究将在约翰霍普金斯大学进行，实验研究将在贝尔大学进行。作为这个项目的一部分，一名研究生将在贝尔大学度过一段时间。杜邦（DuPont）、惠普（Hewlett-Packard）、瓦里安（Varian）和IBM也表示对这项研究感兴趣。CMR锰矿是一种钙钛矿材料，在几个特斯拉的磁场作用下，其电阻率可以发生数量级的变化。虽然没有立即的商业应用，但人们普遍认为，这种戏剧性的效果将对技术有用。很明显，给定CMR材料样品的物理性质很大程度上取决于样品的形式和样品的制备方式。如果要使这些材料在技术上有用，就必须理解和控制这些物理性质对材料性质的依赖。所观察到的变率的一个重要来源很可能是应变。本研究的主要重点将是理解和量化应变对材料性能的影响，但也可以考虑CMR与其他材料之间存在结所产生的其他影响。这是由材料研究部和多学科活动办公室资助的“与行业学术联络资助机会”（GOALI）计划下的一个奖项。为研究巨磁阻（CMR）锰矿石的材料性能与物理性能之间的关系提供了支持。重点将放在应变如何影响材料性能上。这项研究将由约翰霍普金斯大学和朗讯科技的贝尔实验室合作完成。理论研究将在约翰霍普金斯大学进行，实验研究将在贝尔大学进行。作为这个项目的一部分，一名研究生将在贝尔大学度过一段时间。杜邦（DuPont）、惠普（Hewlett-Packard）、瓦里安（Varian）和IBM也表示对这项研究感兴趣。CMR锰矿是一种钙钛矿材料，在几个特斯拉的磁场作用下，其电阻率可以发生数量级的变化。虽然没有立即的商业应用，但人们普遍认为，这种戏剧性的效果将对技术有用。很明显，给定CMR材料样品的物理性质很大程度上取决于样品的形式和样品的制备方式。如果要使这些材料在技术上有用，就必须理解和控制这些物理性质对材料性质的依赖。所观察到的变率的一个重要来源很可能是应变。本研究的主要重点将是理解和量化应变对材料性能的影响，但也可以考虑CMR与其他材料之间存在结所产生的其他影响。＊＊＊

9705482 Millis This is a award under the Grant Opportunities for Academic Liaison with Industry (GOALI) program and is funded by the Division of Materials Research and the Office of Multidisciplinary Activities. Support will be provided for research on the relation between materials properties and physical properties of the colossal magnetoresistance (CMR) manganites. The focus will be on how strain affects materials properties. The research will be done as a collaboration between Johns Hopkins University and Bell Laboratories of Lucent Technologies. Theoretical research will be done at Johns Hopkins and experimental research will be done at Bell. A graduate student will spend time at Bell as part of this project. Expressions of interest in this research have also been given by DuPont, Hewlett-Packard, Varian and IBM. CMR manganites are perovskite materials in which the resistivity can be changed by orders of magnitude by application of a few Tesla magnetic field. While there is no immediate commercial application, it is widely believed that such a dramatic effect will be useful for technology. It has become clear that the physical properties of a given sample of CMR material depend strongly on sample form and on how the sample was prepared. This dependence of physical properties on materials properties must be understood and controlled if these materials are to be technologically useful. It is likely that one important source of the observed variability is strain. The main focus of this research will be on understanding and quantifying the effects of strain on materials properties, but other effects arising from the presence of junctions between CMR and other materials may also be considered. %%% This is a award under the Grant Opportunities for Academic Liaison with Industry (GOALI) program and is funded by the Division of Materials Research and the Office of Multidisciplinary Activities. Support will be provided for research on the relation b etween materials properties and physical properties of the colossal magnetoresistance (CMR) manganites. The focus will be on how strain affects materials properties. The research will be done as a collaboration between Johns Hopkins University and Bell Laboratories of Lucent Technologies. Theoretical research will be done at Johns Hopkins and experimental research will be done at Bell. A graduate student will spend time at Bell as part of this project. Expressions of interest in this research have also been given by DuPont, Hewlett-Packard, Varian and IBM. CMR manganites are perovskite materials in which the resistivity can be changed by orders of magnitude by application of a few Tesla magnetic field. While there is no immediate commercial application, it is widely believed that such a dramatic effect will be useful for technology. It has become clear that the physical properties of a given sample of CMR material depend strongly on sample form and on how the sample was prepared. This dependence of physical properties on materials properties must be understood and controlled if these materials are to be technologically useful. It is likely that one important source of the observed variability is strain. The main focus of this research will be on understanding and quantifying the effects of strain on materials properties, but other effects arising from the presenae of junctions between CMR and other materials may also be considered. ***