By using a superconductor, the energy loss due to electrical resistance can be reduced to zero.Among them, cuprate superconductors whose superconducting transition temperature exceeds the temperature of liquid nitrogen can significantly reduce the cost of cooling materials, and research into their practical application as materials for lossless transmission lines and superconducting electromagnets is underway. I came.

 In lead and aluminum, superconductivity is developed by mediating lattice vibrations between repulsive electrons.On the other hand, it is difficult to identify the identity of the "leader" who develops high-temperature superconductivity in copper oxide, and fierce controversy has continued for more than 15 years.This time, research groups such as Osaka Prefecture University and Hiroshima University have succeeded in capturing definitive evidence of this "leader".

 The research group has combined high-intensity synchrotron radiation with the world's highest level high-resolution, angle-resolved photoelectron spectrometer to precisely observe changes in electron velocity in cuprate superconductors and to observe microstructures. Achieves separation.Furthermore, by extremely increasing the amount of holes added, we succeeded in observing all the traces of the interaction between the electrons and the "leader".The traces are completely in agreement with the distribution of lattice vibrations, and it was clarified that the electrons responsible for high-temperature superconductivity are most strongly linked to lattice vibrations.

 This achievement, which elucidated the whole picture of the lattice vibrations involved in high-temperature superconductivity and resolved the long-standing controversy, provided a guideline to guide the search for further high-temperature superconductors from the viewpoint of the exchange of electrons and lattice vibrations, and made high-temperature superconductors. It is expected to promote the development of materials used.

Paper information:[Scientific Reports] A New Landscape of Multiple Dispersion Kinks in a High-Tc Cuprate Superconductor

Tokyo University

Established in the 10th year of the Meiji era.A university with the longest history in Japan and at the forefront of Japanese knowledge

The University of Tokyo was established in 1877 (Meiji 10) by integrating the Tokyo Kaisei School and the Tokyo Medical School.Since its establishment, it has developed education and research in a unique way in the world as a leading university in Japan and an academic center for the fusion of East and West cultures.As a result, many human resources have been produced in a wide range of fields, and many research achievements […]

Hiroshima University

Learning to design your own life. A university that will shine in the world even after 100 years

5 undergraduate faculties and 12 research areas under the five principles of "spirit of seeking peace," "creation of new knowledge," "education to cultivate a rich sense of humanity," "coexistence with local and international communities," and "constant self-transformation." Comprehensive research university with Department 4 Research Institute.Promoting university reforms that focus on both educational and research capabilities, while continuously producing global human resources[…]

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