Abstract
The compound FeTAC, [(CH3)3NH]FeCl3⋅2H2O, has been reported to be a highly anisotropic, effective S=1/2, one-dimensional ferromagnet above the ordering temperature Tc=3.1 K.1 Our previous low temperature susceptibility measurements in the range of 4.2<T<20 K, and the analysis based on Johnson and Bonner theory, indicate that the susceptibility is almost entirely represented by spin-reversed clusters.2 Here we report our preliminary results of electron paramagnetic resonance measurements at 9.2 GHz on this compound at low temperatures. The most interesting feature of the data along the easy axis is the appearance of the resonance peaks corresponding to g values of about 3.2, 6.4, and 9.6 at 4.2 K (≳Tc). We identify these multiple g-values as an indication of reversal of clusters, of 1, 2, and 3 spins. Bound states have been observed in other Ising systems, such as CoCl2⋅2H2O, in the ordered state.3 To our knowledge, FeTAC is the first compound to show bound state resonance in the paramagnetic region.<ks>
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