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We report on pulsed field magnetization and ESR measurements of the family of copper(II)-substituted polyoxotungstates [Cu3(H2O)3(α-XW9O33)2]12−. (X = As, Sb) where the three Cu2+(S = 1/2) ions form an antiferromagnetically-coupled triangle. The distinct features are the observation of half step magnetization and hysteresis loops as well as asymmetric/symmetric magnetization between a positive and negative field, depending on the diamagnetic heteroatom X. This is attributed to the interplay between an adiabatic magnetization and Dzyaloshinskii-Moriya interactions. Moreover, the more symmetric magnetization curve of X = Sb is discussed in terms of dynamical mixing of a S = 1/2 state via a phonon mode.

Half-Step magnetization in the polyoxometalate family with {Cu3}-type triangular spin ring

Half-Step magnetization in the polyoxometalate family with {Cu₃}-type triangular spin ring