Impurity effect of the spin-ladder system SrCu2O3

The existence of the antiferromagnetic (AF) long-range order in nonmagnetic impurity-doped ladder system Sr(Cu1-xMx)(2)O-3 (M = Zn, Ni) with x = 0.01 and 0.02 has been confirmed from the observations of the broadened Cu nucle ar quadrupole resonance (NQR) spectrum due to the hyperfine (internal) fiel d and the drastic change of the Gaussian spin-echo decay rate, T-2G(-1), at 1.4 K. From Cu NMR and NQR results, we propose a possible spin configurati on of the AF staggered moments in the ordered state. (C) 1999 Elsevier Scie nce B.V. All rights reserved.