我国科研团队在量子磁性材料领域取得重大突破，成功实现了无液氦极低温制冷。这是人类首次在实际固体中给出超固态存在的实验证据。
据悉，中国科学院大学苏刚教授、中国科学院物理研究所项俊森博士和孙培杰研究员、中国科学院理论物理研究所李伟研究员、北京航空航天大学金文涛副教授等人组成的联合研究团队通过多年研究，证实了阻挫量子磁体中超固态（自旋超固态）的存在，有望为极低温制冷提供新的技术方案。
该科研成果已于 1 月 11 日以“Giant magnetocaloric effect in spin supersolid candidate Na2BaCo(PO4)2”为题发表在《自然》上。据介绍，钴基三角晶格量子磁性材料在自旋超固态量子临界点附近具有巨大的磁熵变，足够引起巨磁卡效应。随后，他们利用该晶体材料，通过绝热去磁获得了 94 毫开（零下 273.056 摄氏度）的极低温，成功实现了亚开温区无液氦极低温制冷。
这一新物态与新效应的发现是基础研究的一项重大突破，也为我国在深空探测、量子科技、物质科学等尖端领域研究的极低温制冷难题提供了一种新的解决方案。
英语如下：
“News Title: Chinese Research Team Achieves Cryogenic”News Title: Chinese Research Team Achieves Cryogenic Cooling Without Liquid Helium
Keywords: Cryogenic cooling without liquid helium, Supersolid, Magnetocaloric effect
News Content: A major breakthrough has been achieved by a Chinese research team in the field of quantum magnetic materials, as they have successfully realized cryogenic cooling without liquid helium. This is the first time that experimental evidence of supersolid existence in actual solids has been given by humans.
According to reports, a joint research team composed of Professor Su Gang from the University of Chinese Academy of Sciences, Dr. Xiang Junsen and Researcher Sun Peijie from the Institute of Physics, Chinese Academy of Sciences, Professor Li Wei from the Institute of Theoretical Physics, Chinese Academy of Sciences, and Associate Professor Jin Wentao from Beihang University, through years of research, have confirmed the existence of a supersolid (spin supersolid) in frustrated quantum magnets, which is expected to provide a new technical solution for cryogenic cooling at extremely low temperatures.
This scientific achievement was published on January 11th under the title “Giant magnetocaloric effect in spin supersolid candidate Na2BaCo(PO4)2″ in Nature. It is reported that cobalt-based triangular lattice quantum magnetic materials have a huge magnetization change near the spin supersolid quantum critical point, which is sufficient to cause a giant magnetocaloric effect. Subsequently, they used this crystal material to obtain an extremely low temperature of 94 millikelvins (minus 273.056 degrees Celsius) through adiabatic demagnetization, successfully realizing cryogenic cooling at sub-kelvin temperatures without liquid helium.
The discovery of this new state of matter and effect is a major breakthrough in basic research, and also provides a new solution to the problem of cryogenic cooling at extremely low temperatures in cutting-edge fields such as deep space exploration, quantum technology, and material science in China.”
【来源】https://www.ithome.com/0/745/115.htm
Views: 1