Compounds with a two-dimensional layered structure will exhibit multiple functions such as high-temperature superconductivity and thermoelectric conversion. Not only the functionality, but also the occurrence of special physical phenomena caused by the two-dimensional electronic state. This is also a characteristic of compounds with a two-dimensional layered structure. Scientists have been looking forward to discovering new layered compounds with unprecedented new properties.
This time, Associate Professor Mizuguchi and Special Researcher Rajveer Jha of the Graduate School of Science, Tokyo Graduate School, Capital University of Japan, and Assistant Professor Nagao Yaze of the Crystal Science Research Center of Yamanashi University, found that A new layered superconductor La2O2Bi3Ag0.6Sn0.4S5.7Se0.3 with sulfur and selenium as the conductive layer.
The crystal structure of the superconductor discovered this time is similar to the BiS2 series layered superconductor discovered by Associate Professor Mizuguchi and others in 2012, but it is a new layered superconductor with multiple conductive layers. Since the superconducting phenomenon is also observed in La2O2Bi3Ag0.6Sn0.4S5.7Se0.3 with a multi-layer conductive layer, it is expected to be developed based on this research as the BiS2 layered compound studied as a superconductor and thermoelectric conversion material A variety of layered functional materials such as new superconductors and new thermoelectric conversion materials
Clearly arranging the atomic arrangement of graphene superconducting materials is expected to achieve zero energy consumption and high speed nano devices. The research team composed of the University of Tokyo, Waseda University, Japan Atomic Energy Research and Development Agency, and High Energy Accelerator Research Institution, etc., used the experimental method of "Total Reflection High Speed Positron Diffraction Method" (TRHEPD method) to clarify for the first time the carbon atom layer graphene and The atomic arrangement of two-dimensional compounds with superconducting properties formed by calcium. In addition, the research team confirmed through experiments that this atomic arrangement shows superconductivity with zero resistance. This time, the atomic arrangement of new compounds using graphene was clarified, which opened the way for the development of materials such as zero-energy ultra-high-speed information processing nanodevices using graphene.