Researchers have made great breakthroughs in explaining the rare properties of a rare magnetic material, and it is possible to open up a path for mastering a series of new technologies. From information storage to magnetic refrigeration, many of the most promising innovations in the future rely on advanced magnetic materials, and this new discovery will open the door to the ease of use of the physical properties of magnetic materials.
The work was jointly led by physicist Ignace Jerry of the Brookhaven National Laboratory and Jason Hancock, a professor at the University of Connecticut. The work was done in collaboration with Argonne National Laboratories and Japanese researchers. A major breakthrough has been made in finding practical materials that meet the requirements of the next generation of multiple technologies. Related papers were published this week in the Physical Review Letters.
Japanese scientists first discovered the "Kondo Effect" more than 40 years ago, which means that crystalline metals containing a very small amount of magnetic impurities exhibit extremely low resistance at low temperatures. According to the report of the Physicist Organization Network on March 25 (Beijing time), the researchers studied a material called yttrium indium copper alloy (YbInCu4). The magnetic properties of the alloy are believed to produce unique transformations as the temperature changes. At a certain temperature, its magnetism disappears, and above this temperature it increases magnetism. This conversion has plagued physicists for decades and it has finally been solved.
The electronic energy gap defines the movement of electrons within the material. It is an important factor in understanding the electromagnetic properties of materials. “There is an energy gap in the electronic spectrum, and the Kondo effect caused by its energy conversion suddenly and dramatically increases.†Jerry said, “Our findings show that tailor-made semiconductor energy gaps can be used to control the Kondo effect in process materials and Magnetic, like a compact and convenient knob."
The new study uses a new technique called resonant elastic X-ray scattering (RIXS). The research team focused the high-strength X-ray beam generated by the synchrotron of Argonne National Laboratory and the United States Department of Energy on the material. Through sensitive measurement and analysis of the scattering, the electronic energy gap of the material and its associated mysterious magnetic behavior can be discovered. . By studying changes in the magnetic field under varying temperature conditions, new technologies can be used to develop new materials with strong magnetocaloric effects, some of which may even appear at room temperature.
If you really find materials with Kondo effect at room temperature, the refrigeration technology will revolutionize completely. U.S. domestic air conditioners use more than $11 billion in energy costs and release 100 million tons of carbon dioxide annually. The use of magnetocaloric effects instead of mechanical fans and pumps for magnetic refrigeration will significantly reduce energy consumption and carbon dioxide emissions.
In addition to the potential application value for the development of new technologies, this result has also greatly promoted the level of research. "The RIXS technology we have developed can be applied to other basic energy sciences." Hancock said that this result appears very timely and may be useful in searching for "topological Kondo Insulator" materials, "in theory this material It has been predicted that it exists but has not yet been discovered in reality." (Reporter Fanglin Lin)
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