J. Phys. Chem. C: Dr. Zhong Guohua, Shenzhen Advanced Institute of Chinese Academy of Sciences reveals the microstructure of potassium doped triphenyls high temperature superconductors

Recently, Dr Zhong Guohua, Shenzhen Institute of advanced technology, Chinese Academy of Sciences, established the micro image of kxc18h14 through research, and revealed its crystal structure and electronic characteristics The related achievements were published on the Journal of Physical Chemistry C, under the title of structural and binding characteristics of potassium doped pterphenyl superconductors (DOI: 10.1021 / ACS Jpcc 7b12616) potassium doped p-type triphenyls (kxc18h14) are potential room temperature superconductors In recent years, it has been found that it has superconductivity of more than 120K, but its microstructure and electronic characteristics are not clear For this reason, Zhong Guohua and his collaborators systematically studied the thermal stability, crystal structure, electronic and magnetic properties of kxc18h14 by the first principle method Combining the formation energy, bond characteristics and XRD results, they pointed out that the doping concentration of the superconducting phase should be confined within the range of x = 2 to 3 For a small amount of charge transfer, the torsional force between the adjacent benzene rings makes the system stable in the antiferromagnetic ground state, while with the increase of charge transfer, the system shows non-magnetic characteristics The diversity of band structure at Fermi level suggests that the driving mechanism of superconductivity is complex This progress is of great significance to understand this new superconducting phase The research was supported by NSFC, Shenzhen basic research project and NSFC Guangdong joint fund About the author: Dr Zhong Guohua