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The University of Houston’s official website issued an announcement on October 30th that scientists from the Texas Superconductor Center published in the “Proceedings of the National Academy of Sciences†said that they can induce superconductivity in non-superconducting materials. Enhances superconducting properties of superconducting materials and expands their application range.
The Chinese-American scientist Zhu Jingwu and his team used interface assembly technology to induce the superconductivity of the non-superconducting material calcium-iron-arsenic composite interface, providing a new discovery of high-temperature superconductors (that is, showing superconductivity at higher temperatures). method. In the 1970s, scientists first proposed the theory that “superconductivity can be induced at the junction of two different materialsâ€, but no experimental evidence has been obtained. There have also been some experiments to try to prove this theory, but it has not been possible to rule out the interference of high-pressure and chemical doping, and new research has verified this theory with a history of more than 30 years. Zhu Jingwu explained: “Our research has clearly demonstrated that the interface between the antiferromagnetic layer and the metal layer can be induced to conduct superconductivity, thereby transforming common common non-superconducting compounds into superconductors.â€
In order to verify this concept, Zhu Jingwu's team chose a calcium-iron-arsenic compound that was not chemically doped, heated to 350 degrees Celsius under atmospheric pressure, and then annealed. Annealing is a heat treatment process, usually the material is heated to a certain temperature for a sufficient period of time, and then cooled at an appropriate rate. In the annealing process, calcium and iron arsenic form two different phase layers. The longer the annealing time is, the more the two phase layers merge into each other. Although neither phase showed superconductivity, they detected superconductivity at the junction.
Superconductivity applications are very extensive. For example, superconducting materials can be used to increase power generation efficiency and reduce fuel consumption. The most widely used field is the medical nuclear magnetic resonance field. However, superconductivity often requires cooling to absolute zero, which raises technical costs and hinders popularization. The new research allows scientists to develop a variety of cheaper and more efficient superconducting materials and find superconductors that can exhibit superconductivity at higher temperatures. (Reporter Nie Cuirong)
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