SUPERCONDUCTING AND MAGNETIC PROPERTIES OF Fe-DOPED OXIDE SUPERCONDUCTORS.

The superconducting and magnetic properties of the compounds La//1//. //8//5Sr//0//. //1//5Cu//1// minus //xFe//xO//4 and YBa//2(Cu//1// minus //xFe//x)//3O//7// minus //y with 0 less than x less than 0. 1 are presented. The Fe substitution in the La-Sr compound rapidly depresses T//c, extrapolating to T//c equals 0 for x approximately 0. 02. However, T//c is depressed much less rapidly in the Y-Ba compound, extrapolating to 0 K for x approximately 0. 16. Moessbauer spectroscopy and magnetic data have been obtained to give information on the magnetic and structural properties of these materials. The results are compared with those for other dopants, both magnetic and non-magnetic, in the oxide superconductors.