Superconductivity in B-doped diamonds

Results of theoretical studies on the surprising discovery of superconductivity in B-doped diamonds are presented. It is stressed that the critical temperatures are very high irrespective of the small density of states at the Fermi energy and the presence of strong disorder as deduced both experimentally and theoretically. It is concluded that this strong attractive interaction comes from particular situation where carriers are doped into the covalent bonds of diamond structure, which naturally have very high Debye frequency. It is indicated that such transformation of covalent bonds into conduction bands by carrier doping can be a candidate for higher critical temperature.