We performed magnetic susceptibility and high-field magnetization measurements on a powder sample of a copper tetramer chain compound Cu(3-Clpy)2(N3)2 (3-Clpy = 3-Chloropyridine). Magnetic susceptibility (χ) times temperature (T) decreases gradually with decreasing temperature from 300 K and increases steeply after reaching a minimum at 10 K. The high-field magnetization of this compound at 1.3 K shows a plateau at a half of the saturation magnetization up to 250 kOe and a successive abrupt increase near the saturation field. We compare these experimental data with those calculated for the S = 1/2 ferromagnetic-ferromagnetic-antiferromagnetic-antiferromagnetic (F-F-AF-AF) tetramer chain and obtained fairly good agreement between them when the ratio of the ferromagnetic exchange constant to the antiferromagnetic one is -0.5. The abrupt increase of magnetization near the saturation field is discussed.
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