Abstract
CuCl2⋅TMSO is one of a series of linear chain spin 1/2 compounds with predominantly ferromagnetic interactions in the paramagnetic state. Initial studies conducted on powders showed the exchange interaction J to be large (J/k = 39 K) with significant antiferromagnetic interchain exchange (J′/J = −0.02). This paper reports the results of single crystal susceptibility, magnetization, and antiferromagnetic resonance studies on this material. The orthorhombic compound orders antiferromagnetically at 3.3 K with the easy axis canted to the chains. Spin-flop transitions are observed upon the application of small fields (<5 kOe) within the ac plane. A molecular field model estimates the antiferromagnetic exchange field and anisotropic field to be 2×10−2 and 10−3 as large as the ferromagnetic exchange field. AFMR measurements indicate a four-sublattice arrangement, with the moments inclined alternately ±55° to the chain axis. A four-sublattice model is proposed for the magnetic structure.
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