It is known that superconducting technology is used in MRI (Magnetic Resonance Imaging) equipment in the medical field and in silicon crystal furnace pulling equipment in the semiconductor field. Conventional superconducting devices use metal-based low-temperature superconductors cooled by liquid helium (minus 269 degrees Celsius). However, liquid helium is a rare natural resource, and there are problems in terms of price hikes and procurement. Therefore, the rare-earth-based high-temperature superconductors we at Fujikura are developing are expected to be put into practical use soon, which will realize next-generation high-temperature superconducting applications with no use of liquid helium.The rare-earth-based high temperature superconductors are manufactured by depositing an copper-oxide-based superconducting material made of rare earth (Yttrium, etc.) on a nickel-based substrate through a buffer layer fabricated by ion beam assisted deposition (IBAD). They are high performance materials among high-temperature superconductors and especially show high critical current performance in a strong magnetic field, high current density and low AC loss.Since the discovery of high-temperature superconducting materials in 1987, we have focused on development of rare-earth-based high-temperature superconductors and achieved world's top superconducting performance. At present, we are performing the development of mass-production technology for a longer piece and a lower cost. We are also actively developing applications such as superconducting coils.We will continue our research and development to contribute to a low-carbon society by providing our rare-earth-based high-temperature superconducting products.