E. Burzo et al., MAGNETIC-PROPERTIES OF YBA2(CU(1-X)M(X))(3)O-7-DELTA (M=ZN, NI) SUPERCONDUCTING COMPOUNDS, Physica. C, Superconductivity, 235, 1994, pp. 1589-1590
The electrical, magnetic and EPR measurements were performed on YBa(2)
Cu(3-X)M(X)O(7-partial derivative) superconducting systems, with M=Zn
and Ni. The transition temperatures and critical current densities wer
e correlated with the number as well as the localization of paramagnet
ic Cu2+ and Ni2+ ions.