  The evidence for a quantum phase transition under the superconducting dome in
the high-$T_c$ cuprates has been controversial. We report low temperature
normal state thermopower(S) measurements in electron-doped
Pr$_{2-x}$Ce$_{x}$CuO$_{4-\delta}$ as a function of doping (x from 0.11 to
0.19). We find that at 2K both S and S/T increase dramatically from x=0.11 to
0.16 and then saturate in the overdoped region. This behavior has a remarkable
similarity to previous Hall effect results in
Pr$_{2-x}$Ce$_{x}$CuO$_{4-\delta}$ . Our results are further evidence for an
antiferromagnetic to paramagnetic quantum phase transition in electron-doped
cuprates near x=0.16.
