Researchers have found new good catalysts using unique 'Heusler' alloys, following an interdisciplinary approach. Most studies on catalysts have been conducted by researchers in chemistry. However, catalysts also relate to other research fields. For example, materials science including metallurgy is effective for making and analyzing catalysts, and solid state physics is necessary to understand an electronic structure which is an important factor to catalytic properties. Therefore, an approach from different fields would be effective for catalytic studies.