KONDO EFFECT IN HIGH-T-C CUPRATES

We study the Kondo effect due to the nonmagnetic impurity, e.g., Zn, i n high-T-c cuprates based on the spin-change separated state. In the o ptimal or overdoped case with the Kondo screening, the resistivity is given by rho(T) = 4 (h) over bar/e(2) n(imp)/1-x + alpha T/x (x: hole concentration, n(imp):impurity concentration, alpha: constant), which is in agreement with experiments. In the underdoped region with the ps eudospin gap, an SU(2) formulation predicts that the holon phase shift is related to the formation of the local spin moment, and hence the r esidual resistivity is given by rho(res) = 4 (h) over bar/e(2) n(imp)/ x, which is also consistent with the experiments. the magnetic impurit y case, e.g., Ni, is also discussed. [S001-9007(97)04488-8].