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Crystal and magnetic structures of afeIIFeIII(C2O4)3 (A = organic cation): two-dimensional honeycomb ferrimagnets.

Authors :
Carling SG
Day P
Nuttall CJ
Source :
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2001 Sep 01; Vol. 57 (10), pp. 1971-9.
Publication Year :
2001

Abstract

Ferrimagnetic tris-oxalato-ferrate(II,III) salts with general formula AFeIIFeIII(C2O4)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 Néet type N magnetisation below a compensation temperature Tcomp. The compounds having negative magnetisation show a discontinuity in the magnetisation at a temperature between Tcomp and Tc 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 FeII and FeIII.

Details

Language :
English
ISSN :
1386-1425
Volume :
57
Issue :
10
Database :
MEDLINE
Journal :
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
Publication Type :
Academic Journal
Accession number :
11666077
Full Text :
https://doi.org/10.1016/s1386-1425(01)00482-6