Abstract
We report magnetic properties of a new class of hybrid organic/inorganic layered materials, Cu2(OH)3(CmH2m+1COO), m=7, 9, and 11. The frequency dependence of the linear ac susceptibility and the irreversibility in the field-cooled/zero-field-cooled magnetization show that the geometrical frustration of the triangular lattice is strong enough to cause glassiness. The strong peak in the second harmonic of the nonlinear ac susceptibility indicates that frustration is not sufficient to prevent the system from developing a spontaneous moment. We propose that the interplay of Heisenberg antiferromagnetic exchange and Dzyaloshinskii–Moriya interaction leads to the unusual coexistence of glassiness and canted antiferromagnetism.
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