NMR spectroscopy of iron-based superconductors in very high magnetic fields

极高磁场中铁基超导体的核磁共振波谱

• 批准号: 223405560
• 负责人: Dr. Hannes Kühne
• 金额: --
• 依托单位: Hochfeld-Magnetlabor Dresden
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/223405560?language=en
• 关键词: NMR; spectroscopy; iron; based; superconductors

The aim of this research project is to characterize the electronic ground states of iron-based high-temperature superconductors in high magnetic fields by means of NMR spectroscopy. The results of these studies will help to clarify the relevance of magnetic fluctuations for the appearance of superconductivity as well as the interplay between local magnetic order and superconductivity in these compounds. The stoichiometric superconductor LiFeAs as well as samples of LaOFeAs with different fluorine doping levels will be investigated in magnetic fields up to 45 T, close to the superconducting phase boundary. This allows a comparison of the magnetic fluctuation spectra in the superconducting and normal conducting state. Further, pressure-dependent measurements on the superconductor Sr2VO3FeAs will be performed in order to study the hybridization of electronic states in the FeAs planes and the perovskite-type interlayers. The research project will be conducted at the National High Magnetic Field Laboratory in Tallahassee, Florida.

本研究计划的目的是利用核磁共振波谱技术来表征铁基高温超导体在强磁场中的电子基态。这些研究的结果将有助于澄清磁涨落的超导电性的外观，以及在这些化合物的局部磁秩序和超导电性之间的相互作用的相关性。化学计量比的超导体LiFeAs以及具有不同氟掺杂水平的LaOFeAs样品将在高达45 T的磁场中进行研究，接近超导相边界。这允许在超导和正常导电状态下的磁涨落谱的比较。此外，还将对超导体Sr 2VO 3FeAs进行压力相关测量，以研究FeAs平面和钙钛矿型夹层中电子态的杂交。该研究项目将在佛罗里达塔拉哈西的国家高磁场实验室进行。

项目成果

Progressive slowing down of spin fluctuations in underdoped LaFeAsO 1 − x F x

• DOI: 10.1103/physrevb.88.104503
• 发表时间: 2013-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: F. Hammerath;U. Gräfe;T. Kühne;H. Kühne;P. Kuhns;A. Reyes;G. Lang;S. Wurmehl;B. Büchner;P. Carretta;H. Grafe