Recently, the strong magnetic field science center of the Chinese Academy of Sciences has initially established an extremely low temperature test system, through which electrical transmission, thermal transportation, and magnetic measurements in the temperature range from 325 mKelvin to room temperature can be performed. This system is also the first domestic test system that can simultaneously obtain two extreme conditions of strong magnetic field and extremely low temperature.


Extreme conditions mainly refer to artificially created physical conditions that reach or approach the current technological limits, such as extremely low temperatures, ultra-high pressures, and strong magnetic fields. Experiments under extreme conditions can expand the space and means of scientific research, and provide unprecedented opportunities for solving difficult problems in many current major scientific technologies, as well as creating new physical states, synthesizing new materials, and discovering new phenomena.


At present, scientific research under extreme conditions is becoming more and more in-depth, and even a variety of extreme conditions need to be integrated, but it is very difficult to obtain strong magnetic fields and extremely low temperatures at the same time. This is because the aperture of water-cooled magnets that can obtain high field strength is usually designed to be very small, and obtaining extremely low temperatures in a narrow space is a great challenge to scheme design, material selection, device processing, and installation. In order to overcome the shortcomings of the existing technical means, the scientific researchers of the strong magnetic field center of the Chinese Academy of Sciences have finally determined the design plan by drawing on the experience of the international strong magnetic field laboratory. The plan uses five layers of thin-walled stainless steel tubes in a 6.6mm space. The transition from room temperature to 325 mKelvin can be achieved.


It is reported that after the system was initially completed, the scientific research personnel successfully tested the relationship between the transport characteristics of the ZrTe5 single crystal sample and the magnetic field under the temperature of 325 milliKelvin, and the magnetic field test range was 0-25T. This experiment is also the first scientific experiment in China under the combination of steady-state strong magnetic field and extremely low temperature conditions. (Source: Jijing)