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Inelastic neutron scattering experiments were performed for the spin-trimercompounds Ca3Cu3-xNix(PO4)4 (x=0,1,2) in order to study the dynamic magneticproperties. The observed excitations can be associated with transitions betweenthe low-lying electronic states of linear Cu-Cu-Cu, Cu-Cu-Ni, and Ni-Cu-Nitrimers which are the basic constituents of the title compounds. The exchangeinteractions within the trimers are well described by the Heisenberg model withdominant antiferromagnetic nearest-neighbor interactions J. For x=0 we findJCu-Cu=-4.74(2) meV which is enhanced for x=1 to JCu-Cu=-4.92(6) meV. For x=1and x=2 we find JCu-Ni=-0.85(10) meV and an axial single-ion anisotropyparameter DNi=-0.7(1) meV. While the x=0 and x=1 compounds do not exhibitlong-range magnetic ordering down to 1 K, the x=2 compound showsantiferromagnetic ordering below TN=20 K, which is compatible with themolecular-field parameter 0.63(12) meV derived by neutron spectroscopy.

Magnetic excitations in the spin-trimer compounds Ca3Cu3-xNix(PO4)4 (x=0,1,2)