Muon spin rotation/relaxation investigations of magnetism in superconductors and coordination polymers

超导体和配位聚合物中磁性的μ子自旋旋转/弛豫研究

• 批准号: 238307-2011
• 负责人: Sonier, Jeffrey
• 金额: $ 1.6万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=570391
• 关键词: Muon; spin; rotation; relaxation; investigations

This proposal will primarily utilize newly constructed muon surface beam lines and the beta-decay NMR facility at TRIUMF to: 1) investigate the role inhomogeneity plays in the mechanism of high-temperature superconductivity, 2) determine the relevance of newly discovered magnetism in the heavily overdoped regime of high-temperature superconductors, 3) characterize and optimize magnetic interactions in a series of novel coordination polymers that make use of cyanometallate building blocks, 4) investigate the pairing symmetry of iron-based superconductors via measurements in the vortex state, 5) investigate the role of magnetic flux penetration in RF losses of superconducting Nb cavities used for charged-particle accelerators, and 6) investigate surface magnetism in gold nanostructures. In addition we will continue the development of a hyperpolarized xenon gas NMR method as an exquisitely senstive probe of surface properties with the potential to discover novel behaviour that has practical device applications. The muon spin rotation/relaxation (muSR) technique is unique in its ability to locally probe magnetism in materials, and for this purpose Canada has recently invested heavily in the construction and operation of new muon beam lines at TRIUMF. This proposal will exploit these new muSR capabilities as either the only means to collect information or to complement data obtained by other methods. Primary themes of this proposal include understanding the importance of nanoscale inhomogeneity on the development of a room-temperature superconductor, and controlled assembly of molecular building blocks in a predictable way as a means of designing a new generation of advanced magnetic materials.

该提案将主要利用新建的MUON表面光束线和Triumf的Beta-Decay NMR设施：1）研究作用不均匀性在高温超导性机制中起着不均匀性的作用，2）确定在重大发现的磁性中的相关性高温超导体的过量政权，3）在一系列新型的配位聚合物中表征和优化磁相互作用，这些磁相互作用利用氰化分析构建块，4）研究通过涡旋状态中的测量结果研究基于铁的超导体的配对对称性，5）研究磁通量渗透在用于带电粒子加速器的超导NB腔的RF损失中的作用，6）研究金纳米结构中的表面磁性。此外，我们将继续开发超极化的氙气NMR方法，作为对表面特性的精确探测，并有可能发现具有实际设备应用的新型行为。 MUON自旋旋转/松弛（MUSR）技术在局部探测磁性的能力方面是独一无二的 材料，为此，加拿大最近在Triumf的新Muon Beam Lines的建设和运行方面进行了大量投资。该提案将利用这些新的MUSR功能作为收集信息或补充其他方法获得的数据的唯一手段。该提案的主要主题包括了解纳米级不均匀性对室温超导体发展的重要性，以及以可预测的方式对分子构建块的受控组装，作为设计新一代高级磁性材料的一种手段。