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I am studying the physics, especially the electromagnetic wave, which is the wave of electric and magnetic fields oscillating spatially and temporally. The light is the electromagnetic wave to be seen by our eyes. The radio wave, microwave, infrared light, ultraviolet light, X ray, and gamma ray are all electromagnetic waves. On the other hand, a static (temporally non-oscillating) magnetic field emerges from a magnet. The superradiant phase transition (SRPT) means a spontaneous appearance of a static electromagnetic field owing to an interaction between the electromagnetic wave and matters. Unfortunately, the SRPT has not yet been observed since its first proposal in 1973. In my recent theoretical and experimental studies with my collaborators, we have found analogues of the SRPT in superconducting circuits and magnetic materials. We are now trying to realize and observe the original SRPT. There should be a possibility that we can directly convert the heat energy to coherent electromagnetic waves, such as the laser light, by controlling the SRPT. Thus, the realization and observation of the SRPT have a potential to contribute to the problem of the increasing energy consumption in the world.