ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The specific heat of several salts in this series of canted antiferromagnets, where A is 4-halopyridinium and X is chloride, bromide or a mixture of the two, is reported over the temperature interval 1.6–40 K.1 All contain the monomeric tetrahedral [FeX4]− ions. The substances include 2[4-Br(py)H] [FeCl4]⋅[4-Br(py)H]Cl (Tc=2.28 K), [4-Cl(py)H]3Fe2Cl9 (2.685 K), [4-Cl(py)H]1.1[4-Br(py)H]1.9Fe2Br9 (7.52 and 7.80 K) and (pyH)3Fe2Cl9 (2.12 K). Odd behavior is observed with several compounds such as [4-Br(py)H]3Fe2Br9, which exhibits two λ features in the specific heat (at 5.23 and 7.635 K) but only one ordering temperature in the ac susceptibility (at 7.70 K). The ordering phenomena are largely three dimensional in nature. The magnetic properties will be correlated with the structures and the likely superexchange paths.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.353695
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