Superconductivity research on boron solids and an efficient doping method

摘要: Boron solids are, similar to diamond, strong electron-phonon coupling systems and therefore potentially have high-Tc superconductivity. For realizing high transition temperature Tc, however, careful control of the valence electrons is necessary, which requires detailed understanding electronic structure. By critically reviewing recent development in this field, along with situation heavily doped diamond clathrates, we show a promising route for Tc boron system. Although both ?- ?-boron become metallic exhibit superconductivity at pressure, covalent character still remains, significantly limits its achieved by applying pressure. Heavy doping related compounds desirable, as long basic structure retained, but it extremely difficult normal conditions. A method achieve pressure synthesis. Similar technique useful heavy diamond. To design high-pressure experiment, role theory important through predicting phase diagram, was not available previously.