Abstract
We report the magnetic properties of Sr- and Bi-substituted samples of the one-dimensional alternating $S=1∕2$ spin chain compound ${\mathrm{Pb}}_{2}{\mathrm{V}}_{3}{\mathrm{O}}_{9}$. In the Sr-substituted system, we obtained two series of samples synthesized by different heat treatments; one series shows the reduction of the spin gap without antiferromagnetic long-range order (AF-LRO) and the other shows AF-LRO at low temperatures. We also observed impurity-induced AF-LRO in the Bi-substituted system. The fitting results of magnetic susceptibilities imply the possible coexistence of a spin gap and AF-LRO in both AF-LRO systems. These observations of AF-LRO with a small amount of substitution indicate that the magnetic instability involving a quantum critical point is inherent in the spin-gap system ${\mathrm{Pb}}_{2}{\mathrm{V}}_{3}{\mathrm{O}}_{9}$.
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