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Israeli scientists have developed light controlled superconducting materials that can change the critical temperature through different types of light

China Science and technology news according to the daily science on August 28 (Beijing time), Israeli scientists have recently developed a superconducting material that can change the critical temperature through light irradiation. With the help of this technology, it is expected to develop a non heating, environment-friendly and efficient storage device. Relevant papers were published in the academic journals Applied Chemistry and Nature Nanotechnology

traditional conductors such as copper and silver will cause their own heating in the process of transmitting electrons, resulting in a certain waste of energy, while superconductors will completely avoid this situation. But it is not easy to make a real superconductor and apply it in reality. The concept of high temperature superconductor has been put forward for more than 20 years. It is still a big problem to find a suitable superconducting material and control it

for superconductors, temperature is a crucial factor. Only when the superconducting material reaches the critical temperature, the expert group believes that the innovation center has successfully completed all tasks during the cultivation period can it have superconducting properties. For a long time, scientists have been looking for ways to change the critical temperature of superconducting materials to make them more practical. Chemical doping is one of them. This method changes the critical temperature and conductivity of superconducting materials by adding or removing some substances from the raw materials

researchers at Tel Aviv University in Israel have found a simpler method. Through unique design, Professor yolam Dagan of the physics and nanotechnology center of the University and his team used ultraviolet and visible light to turn off the power supply of the manipulator and impact the motor source when the experimental machine reached the force value of the dynamometer, which changed the critical temperature of the superconducting material. They added a 50 nanometer thick film of organic molecules to the film of a superconducting material. When light shines on the film, these organic molecules will stretch and their shapes will change accordingly, thus changing the properties of the superconducting film. More importantly, it can change the critical temperature of superconducting materials

researchers tested three different molecular films. The first one can increase the critical temperature of superconducting thin films when irradiated by light; The second kind can increase the critical temperature of superconducting materials when irradiated by ultraviolet light, and reduce the critical temperature when irradiated by visible light; Third, the critical temperature of superconducting thin films can be changed by simply turning on or off light. When irradiated by light, the critical temperature increases, and when turning off light, the critical temperature decreases

Dagan said that this discovery is equivalent to finding a "knob" to control the critical temperature of superconducting materials. Its significance lies in the change of thermal radiation, thermal convection and heat conduction. The traditional research on superconducting materials only focuses on the idea of changing the temperature of superconducting materials, which provides new possibilities for the application and improvement of superconducting technology

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