Magneto-capacitive coupling and hybridization driven structural anomalies in Spinels

点击翻译按钮获取中文摘要

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.