https://doi.org/10.1038/s41586-023-06885-w

https://spc.jst.go.jp/news/240104/topic_2_01.html

After years of research, the joint research team, led by Vice Professor Moon-Tao-Kim of Peking Aeronautical University, has made significant progress in basic research to realize cryogenic cooling without liquid helium and discovered experimental evidence of the existence of spin supersolids in Na₂BaCo(PO₄)₂. The next goal of the research team is to push the limits of cryogenic temperatures even further and complete a cryogenic cooler that does not use liquid helium in the future. The cryogenic cooler will provide a near-absolute-zero operating environment for quantum computers and other applications, and will also be widely applicable in advanced technological fields such as condensed matter physics, materials science, and deep space exploration.