The reporter learned from the University of the Chinese Academy of Sciences that Professor Su Gang and his collaborators,through years of research,have recently achieved extreme low temperature refrigeration without liquid helium,which is expected to provide new technical solutions for extreme low temperature refrigeration,and has application prospects in many high-tech fields.The relevant achievements have been published in the international academic journal Nature.
  It is reported that ultra-low temperature refrigeration technology is widely used in fields such as deep space exploration,materials science,quantum computing,and the construction of large-scale scientific facilities.For a long time,ultra-low temperature refrigeration has mainly been achieved using liquid helium,but helium is relatively scarce in nature.How to achieve ultra-low temperature refrigeration without helium has become an important issue in the scientific community.
  In this study,the team confirmed the existence of supersolids in frustrated quantum magnets in cobalt based triangular lattice quantum magnetic materials.Subsequently,they utilized the crystal material to achieve an extremely low temperature of 94 milliKelvin(minus 273.056 degrees Celsius)through adiabatic demagnetization,successfully achieving liquid helium free extremely low temperature refrigeration.
  "This achievement is expected to provide a new solution for solving the problem of extremely low temperature refrigeration in fields such as deep space exploration,quantum technology,and material science,"said Su Gang.
  The reviewer of Nature magazine commented that this study is a high-quality experiment on a complex compound at ultra-low temperatures,which is expected to lead the scientific community to conduct more extensive and in-depth research in this field.