Magnetic impurities in superconductors

The primary objectives of this report have involved various phenomena in superconductors, with a goal toward formulating a procedure for finding new materials that function at desirable temperatures and exhibit high critical magnetic fields. Much of the effort was devoted to the investigation of the interaction of rare earth impurity spins in a system of conduction electrons which may become superconducting. The normal state resistivity of various heavy fermion alloys has been examined in order to determine the fundamental interactions responsible for the competition between magnetic ordering and superconductivity. Also, the initial research effort on possible room temperature superconductivity of metallic hydrogen has been described. Other topics covered in this report have been the investigation of charge and spin-density waves and the study of electron relaxation relations and transient spectroscopy of alpha-Si:H.