Abstract
The antiferromagnetic (AF) compound ${\mathrm{BaCu}}_{2}{\mathrm{Si}}_{2}{\mathrm{O}}_{7}$ is studied by magnetic susceptibility and neutron-scattering techniques. The observed behavior is dominated by the presence of loosely coupled $S=1/2$ chains with the intrachain AF exchange constant ${J}_{\ensuremath{\Vert}}\ensuremath{\approx}24.1$ meV. Long-range N\'eel ordering is observed below ${T}_{N}\phantom{\rule{0ex}{0ex}}=9.2$ K. The results are discussed within the framework of the mean-field RPA model for weakly interacting quantum spin chains.
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