勝藤研究室
Katsufuji Lab.       Department of Physics, School of Advanced Science and Engineering, Waseda University

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   One of the characteristics of transition-metal oxides is a large response of their physical properties to external fields. The large response occurs not only for the conjugated variable of the external field (e.g., magnetization against magnetic field), but also for other properties that might look unrelated to the external field. For example, some compounds show a drastic change of electrical resistivity, dielectric constant, and even crystal structure under magnetic field. These intriguing behaviors arise from the competition and cooperation between spin, charge, and orbital degrees of freedom of d electrons in the transition metal. The materials showing this kind of behaviors are often called “strongly correlated materials”, and are promising for future "multifunctional" devices.

We are searching for new materials showing a large response of a physical property (electrical resistivity, dielectric constant, crystal structure, optical properties, etc.) to an external filed (magnetic field, electric field, light illumination, etc.) We are also working on the optical investigation of these materials to clarify the electronic origin of such a large response.