Title: Magnetization of the Layer Compounds AFe<sup>II</sup>Fe<sup>III</sup>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub> (A = Organic Cation), in Low and High Magnetic Fields: Manifestation of Néel N and Q Type Ferrimagnetism in a Molecular Lattice
Abstract: Detailed bulk magnetization and magnetic susceptibility measurements are reported for representative examples of the series of ferrimagnetic tris-oxalato-ferrate(II,III) salts with general formula AFeIIFeIII(C2O4)3 (A = quaternary ammonium, phosphonium, or arsonium). The compounds all crystallize in two-dimensional hexagonal honeycomb lattices, but while some show conventional low field positive magnetization at low temperature (Néel type Q), others show a large negative magnetization below a compensation temperature Tcomp (Néel type N) under the same measurement protocol. Isothermal and temperature-dependent magnetizations are measured after zero field and field cooling. Temperature-dependent hysteresis measurements are also presented. In compounds that exhibit negative magnetization a discontinuity in the magnetization is observed at Tt (Tcomp < Tt < Tc) which correlates with the onset of a giant anisotropy and is indicative of a magnetostrictive transition. In compounds that exhibit positive magnetization, hysteresis behavior and frequency-dependent ac susceptibility data indicate a glassy magnetic order at low temperatures, possibly arising from the frustration of random anisotropy domains below a characteristic blocking temperature or imbalance and disorder of Fe(II) and Fe(III).
Publication Year: 1998
Publication Date: 1998-08-22
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 95
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