Magnetic Dimer Excitations in Cs3Cr2CI9 Studied by Neutron Scattering

Bruno Leuenberger, Hans U. Güdel, Jørgen Kjems, Daniel Petitgrand, Leon Brillouin

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    The energy dispersion of the singlet-triplet dimer excitation in Cs3Cr2CI9h as 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 = -1.75 meV (intradimer), J = -0.032 meV (interdimer, intrasublattice) and J, = -0.031 meV (interdimer,i ntersublattice). These values indicate that Cs3Cr26I9is far from ordering magnetically. The systematic variation of the exchange parameters on substitution of C1 by Br and I is discussed.
    Original languageEnglish
    JournalInorganic Chemistry
    Issue number7
    Pages (from-to)1035-1038
    Publication statusPublished - 1985

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