Systematic (63)Cu NQR and (89)Y NMR Study of Spin Dynamics in Y(1-z)Ca(z)Ba(2)Cu(3)O(y) Across Superconductor-Insulator Boundary

P. M. Singer, T. Imai

We demonstrate that the spin dynamics in underdoped Y(1-z)Ca(z)Ba(2)Cu(3)O(y) for y=~6.0 exhibit qualitatively the same behavior to underdoped La(2-x)Sr(x)CuO(4) for an equal amoun…