Effects of nonmagnetic ion substitution for Cu in Sr14Cu24O41 - art. no. 104517

Nonmagnetic ions Zn, Ga, and Al are substituted for Cu in Sr14Cu24O41. Magn etic susceptibility measurements show that substitution affects magnetic pr operties of chains. The Curie-Weiss term at low temperature is almost uncha nged. This suggests that local moments induced by nonmagnetic ions do not c ontribute to the Curie-Weiss term. On the other hand, the susceptibility of the CuO2 chain described by an alternating linear chain suggests that thes e local moments interact with neighboring Cu2+ spins to form a dimer. There is no indication for long-range antiferromagnetic ordering up to x=0.03. R esistivity measurements show that Sr14Cu24O41 becomes less semiconductive w hen Cu is substituted by Zn and Ga, and more semiconductive when substitute d by Al.