Sb. Ogale et al., OBSERVATION OF GIANT T-C DEPRESSION EFFECT IN Y1BA2CU3O7-D DOPED SIMULTANEOUSLY WITH ZU AND FE, Solid state communications, 89(1), 1994, pp. 1-4
The case os simultaneous doping of Fe and Zn in Y1Ba2Cu3O7-d is examin
ed in the context of the issue of T-c depression by magnetic impuritie
s in the high T-c superconductors. It is observed that codoping of Fe
(magnetic) and Zn (diamagnetic) impurities in Y1Ba2Cu3O7-d leads to gi
ant T-c depression, with an almost complete loss of superconductivity
for the total dopant concentration above a certain value; while separa
te doping of Fe or Zn at the same total concentration yield well defin
ed superconducting transitions; though with reduced T-c as compared to
the pure 92 K materials.