BaCu2Si2O7: a new quasi 1-dimensional S = 1/2 antiferromagnetic chain system
Abstract
The new antiferromagnetic (AF) compound BaCu2Si2O7 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 = 24.1 meV. Long-range Neel ordering is observed below Tn = 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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