Antiferromagnetic order in the ladder compound SrCu2O3; Cu-NMR/NQR measurements

We carried out the extensive Cu-nuclear magnetic and quadrupole resonance ( NMR/NQR) experiments on the Zn(Ni)-doped ladder compound SrCu2O3 (Sr123), S r(Cu1-xMx)(2)O-3 (M=Zn and Ni) with x less than or equal to 0.02 and the La -doped Sr123, Sr1-xLaxCu2O3 with x less than or equal to 0.03. A spin-corre lation length xi(s)/a (a: the lattice spacing between the Cu sites along th e leg) of nonmagnetic impurity-induced staggered polarization (IISP) estima ted from a quasi-one-dimensional (Q1D) IISP along the two legs in the 0.1-2 % Zn-doped Sr123 was found to be independent of temperature (T) and scaled to an mean impurity distance D-AV with the relation of xi(s)/a = 2.5 + 0.1 D(AV). The xi(s)/a's are much longer in x: = 0.001 (xi(s)/a similar to 50) and 0.005 (xi(s)/a similar to 12) than an instantaneous spin-correlation le ngth xi(0)/a similar to 3 - 8 in Sr123. The formula of Neel T, T-N(WC-Q1D) = J exp(-D-AV/(xi(s)/a)) (J = 2000 K) based on the weakly interladder-coupl ed (WC) Q1D model explains the experimental T-N values quantitatively.