mu SR study of a spin-ladder system (Cu1-xZnx)(2)(1,4-diazacycloheptane)(2)Cl-4

We measured the muon spin relaxation (mu SR) for Zn doped spin-ladder compo unds (Cu1-xZnx)(2)(1,4-diazacycloheptane)(2)Cl-4 with x = 0 and 0.1 in the temperature region from 2 to 150 K. In both of x = 0 and 0.1 samples, only a slight enhancement of the relaxation is observed at low temperatures. Thi s result indicates that both samples exhibit no magnetic order. Besides, we have not observed significant difference of the mu SR spectra in both samp les. This fact indicates that the Cu2+ spins induced by the impurity fluctu ate fast. (C) 2000 Elsevier Science B.V. All rights reserved.