Magneto-capacitive coupling and hybridization driven structural anomalies in Spinels

尖晶石中磁电容耦合和杂化驱动的结构异常

• 批准号: 53449689
• 负责人: Professor Dr. Peter Lemmens
• 金额: --
• 依托单位: Institut für Physik der Kondensierten Materie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/53449689?language=en
• 关键词: Magneto; capacitive; coupling; hybridization; driven

The aim of our study is to clear up the coupling mechanism and the application of magnetocapacitive effects in spinels, as e.g. CdCr2S4. Multiferroics, with coexistence and mutual coupling of magnetic, dielectric and lattice degrees of freedom are in the centre of present interest. While practical questions involve the maximisation of both coupling constants and characteristic temperature regimes, there are also fundamental issues related to the existence of small energy scales, the effect of local distortions, and the dynamic variation of the electronic structure. Within this project we will perform Raman scattering, ultrasound spectroscopy and preparation of single crystals. Raman scattering is especially sensitive to local polar distortions. Using ultrasound spectroscopy structural and electronic relaxation processes will be studied. Samples will also be doped and optimized with respect to applications.

我们的研究目的是明确的耦合机制和磁电容效应的应用在尖晶石，例如CdCr2S4。多铁性，磁，介电和晶格自由度的共存和相互耦合是目前的兴趣中心。虽然实际问题涉及耦合常数和特征温度制度的最大化，也有一些基本问题涉及到小能量尺度的存在，局部扭曲的影响，以及电子结构的动态变化。在这个项目中，我们将进行拉曼散射，超声光谱和单晶制备。拉曼散射对局部极性畸变特别敏感。利用超声波光谱结构和电子弛豫过程将进行研究。样品也将掺杂和优化方面的应用。