BEIJING, Jan. 14 (Xinhua) -- Chinese scientists have achieved ultra-low temperature refrigeration -- below minus 273 degrees Celsius -- in a recently synthesized supersolid candidate.
The temperature was reached without the use of liquid helium, a conventional material that has long been used in ultra-low temperature refrigeration, according to a paper published in Nature.
Supersolid is a quantum state of matter that possesses a solid structure and shows superfluidity simultaneously. A team of researchers at the University of Chinese Academy of Sciences and their collaborators proved the presence of this exotic state in the synthesized supersolid candidate, a cobalt-based quantum magnetic material.
During the subsequent demagnetization cooling process of the candidate, the researchers observed an ultra-low temperature below 273 degrees Celsius, according to the paper.
The findings have demonstrated a new route to extreme cooling that can be used in fields such as deep space exploration, quantum science and materials science, said Su Gang, the leader of the team. ■