Magnetic susceptibility and optical spectra of the organic-intercalated two-dimensional ferromagnets bis(monomethylammonium)- and bis(monoethylammonium) tetrachlorochromate(II)
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 1207-1212
- https://doi.org/10.1039/dt9780001207
Abstract
The title compounds have been prepared and characterised by chemical analysis and X-ray diffraction. By magmetic-susceptibility and magnetisation measurements they are shown to order ferromagnetically at Tc= 58 ± 2 and 55 ± 2 K respectively. Up to ca. 0.7 Tc the magnetisation M(T) obeys the equation 1 –[M(T)/M(0)]=CTγ where γ= 1.5 ± 0.1. The optical spectra of both compounds contain sharp absorption bands at 533 and 626 nm, assigned as quintet–triplet ligand-field transitions. Up to 0.9 Tc their intensities vary with temperature as T2, as predicted for ‘hot’ exciton–magnon combination bands in a two-dimensional easy-plane ferromagnet.Keywords
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