Research teams at Kyushu Institute of Technology, Kyushu University, University of Hyogo, and Industrial Technology Research Institute have physically elucidated that the superconducting transition temperature of renium metals doubles with the introduction of shear strain.The fact that shear strain, which originally destroys the structure of materials, stabilizes quantum phenomena is a result of overturning the common wisdom of physical property research, and was published in the English scientific journal "Scientific Report".
According to the Kyushu Institute of Technology, the research team applied a pressure of 24 atm and a strain of up to 10 revolutions to a renium metal, which is known to increase the superconducting transition temperature under high pressure, and investigated the change in the superconducting transition temperature. ..As a result, it was found that the superconducting transition temperature of the rhenium metal is about twice as high as that in the unstrained state.
It is clear that the mechanism expands the volume of the unit cell, which is the smallest repeating unit of the crystal, and causes a change in the electronic state, leading to an increase in the superconducting transition temperature when the shear strain causes the micronization of the structure. Became.
The challenge of modern physics is to create superconductivity at room temperature, where the electrical resistance becomes zero when a particular metal or compound is cooled to a very low temperature.In general, when a high pressure is applied to an object, the crystallinity deteriorates due to the shear strain, so researchers have had a hard time reducing the shear strain.
The research team believes that the fact that shear strain that destroys the structural structure stabilizes the superconducting phenomenon is "a fact that upsets the common wisdom of science" and that it has pioneered a new research method for raising the superconducting transition temperature.
