Electron-spin-resonance measurements of Gd in LaA12 exhibit appreciable change of the g value and linewidth upon alloying with other nonmagnetic impurities. This indicates the existence of a "bottleneck effectthe relaxation rate for the conduction electrons to the Gd ions S"exceeds that to the lattice 5,L.We are able to shift the g value from g =1.988+0.003 to g =2.11+0. 01, opening the bottleneck completely. The intermetallic compounds GdLa, "Al, are Abrikosov-Gorkov superconductors in the dilute limit. Measurements of the transition temperature and the upper critical field depend upon 5".directly and 8,1 indirectly. We are thus able to obtain parameters which determine superconducting critical-field and temperature behavior from magnetic resonance experiments.
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