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Abstract
We studied the effects of Zn doped into Cu sites on the magnetism of Cu 3 Mo 2 O 9 . The spin system consists of spin-1/2 antiferromagnetic (AF) uniform chains and AF dimers. Each chain is coupled to neighboring dimers by other interactions, giving rise to magnetic frustration. A component parallel to the chain of magnetic moment in the chain forms AF long-range order (LRO) below the transition temperature T N , whereas a perpendicular component is disordered in zero magnetic field and above 2.0 K. The perpendicular component forms weak ferromagnetic LRO (WF-LRO) only in finite magnetic fields H 's. We have found that WF-LRO in H disappears with a very small amount of Zn doping, although the decrease of T N is negligible at corresponding Zn concentrations. These results are explained by the enhancement of magnetic frustration among symmetric exchange interactions caused by Zn doping.
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