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