= Solution
At high temperature, approximately independent paramagnetic ions give the appropriate <Curie constant>. The negative <Weiss temperatures> and the reduction of $\chi T$ on cooling initially indicate \b[predominantly antiferromagnetic correlations]. The sharp rise near the ordering temperature nevertheless reveals a strongly enhanced low-field magnetic response.
A net moment could arise from a <canted antiferromagnet>, a <ferrimagnet>, or a ferromagnet with competing antiferromagnetic interactions. Differences between <field-cooled magnetization> and <zero-field-cooled magnetization> suggest history-dependent domain selection or slow relaxation, but are not alone proof of a particular microscopic <spin> arrangement. An ordinary compensated antiferromagnet would not account for a large ordering-related ferromagnetic-like low-field contribution without an additional mechanism.
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