We searched for new superconductors using cubic-anvil-type high-pressure apparatus. Samples including valence skip elements such as Bi, Sb were intensively investigated. As a result, we have found new superconductors of LaBi
3 and Ba
2Bi
3 with the superconducting transition temperature (
Tc) of 7.3 K and 4.4 K, respectively. We also succeeded in enhancing
Tc of Au-Sb alloys and SrBi
3 up to 8.1 K and 9.0 K, respectively, by controlling their chemical compositions. In this article, we explain the properties of the superconductors and the research processes that led to the discovery of the new superconductors.
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