C. Geibel et al., IMPURITIES IN A SUPERCONDUCTOR WITH A HIGHLY ANISOTROPIC GAP - UNIVERSAL CORRELATION BETWEEN THE RESIDUAL RESISTIVITY AND T-C IN DOPED UPD2AL3, Physica. C, Superconductivity, 235, 1994, pp. 2435-2436
We have studied the effect of doping on the superconducting transition
temperature T-c and on the residual resistivity rho(0) of the heavy-f
ermion superconductor UPd2Al3. We have found a general correlation bet
ween the increase of rho(0) and the decrease of T-c which seems to be
independent of the type of dopant. We interprete this correlation as a
further evidence for a large anisotropy of the superconducting order
parameter.