Israeli scientists have recently developed a superconducting material that can change the critical temperature through light irradiation. With this technology, it is expected to develop a non-heating, environmentally friendly and efficient storage device. Related papers were published in academic journals Applied Chemistry and Nature Nanotechnology.
Traditional conductors such as copper and silver will cause self-heating during the transmission of electrons, resulting in a certain amount of energy waste, and superconductors will completely avoid this. However, it is not easy to create a real superconductor and make it available in reality. The concept of high-temperature superconductors has been proposed for more than 20 years. Finding suitable superconducting materials and controlling them is still a major problem.
For superconductors, temperature is a critical factor. Superconducting materials do not exhibit superconductivity until they reach critical temperatures. For a long time, scientists have been looking for ways to change the critical temperature of superconducting materials to make them more practical. The chemical doping method is one of them. This method changes the critical temperature and the electrical conductivity of the superconducting material by adding or removing some of the materials to the raw material.
Researchers at Tel Aviv University in Israel found a simpler method. The school's professor of Physics and Nanotechnology Center Yoram Dage and the team used a unique design to change the critical temperature of superconducting materials using different types of light such as ultraviolet and visible light. They added a layer of 50-nanometer-thick organic film to a thin film of superconducting material. When light hits the film, these organic molecules will stretch and the shape will change accordingly, resulting in superconducting films. The nature changed. More importantly, it can change the critical temperature of the superconducting material.
The researchers tested three different molecular films. The first one can increase the critical temperature of the superconducting thin film when irradiated with light; the second can increase the critical temperature of the superconducting material when irradiated with ultraviolet light, and the critical temperature decreases when irradiated with visible light; By simply turning the light on or off, the critical temperature of the superconducting thin film can be changed. When the light is irradiated, the critical temperature increases, and the critical temperature decreases when the light is turned off.
Dagan said that the discovery was equivalent to finding a "knob" that controls the critical temperature of superconducting materials. Its significance lies in changing the thinking that traditional superconducting material research only focuses on changing the temperature of superconducting material itself, and provides new possibilities for the application and improvement of superconducting technology. (Reporter Wang Xiaolong)
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