“…Several analyhighest known superconducting transition temperases [4,6,7,9,13]differing in details, postulate that tures (Ta) [11. For this reason, these materials are the such high resistivities are due to strong interband scatsubject of much current interest. In addition to their tering from a single broad conduction band into an high Ta's, this class of materials exhibits unusual noroverlying high density of states "d" band.…”