The energy dispersion of the singlet-triplet dimer excitation in Cs3Cr2Cl9 has been studied by inelastic neutron scattering (INS) at temperatures down to 1.3 K.The results can be accounted for by using a completely isotropic Heisenberg Hamiltonian in the random phase approximation (RPA).Only nearest-neighbor interactions need to be considered.From the excellent fit, three exchange parameters were obtained: J = -1.75meV (intradimer), J. = -0.032meV (interdimer, intrasublattice) and Jc = -0.031meV (interdimer, intersublattice).These values indicate that Cs3Cr2Cl9 is far from ordering magnetically.The systematic variation 1978; p 296.
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Leuenberger et al. (1985) studied this question.