Abstract
Ferrimagnetic tris-oxalato-ferrate(II,III) salts with general formula AFe IIFe III(C 2O 4) 3 (A=quaternary ammonium, phosphonium) all crystallise in two-dimensional hexagonal honeycomb lattices but while some show conventional Néel type Q magnetisation at low temperature others show negative Néel type N magnetisation below a compensation temperature T comp. The compounds having negative magnetisation show a discontinuity in the magnetisation at a temperature between T comp and T c suggesting a magneto-strictive transition. For the type Q compounds, hysteresis and frequency dependent AC susceptibility show that the low temperature magnetic state is glassy, either because of frustration of random anisotropy domains below a blocking temperature, or imbalance in the fractions of Fe II and Fe III.
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