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Inelastic neutron scattering experiments were performed for the spin-trimer compounds Ca 3 Cu 3 − x Ni x ( P O 4 ) 4 ( x = 0 , 1 , 2 ) in order to study their dynamic magnetic properties. The observed excitations can be associated with transitions between the low-lying electronic states of linear Cu-Cu-Cu, Cu-Cu-Ni, and Ni-Cu-Ni trimers, which are the basic constituents of the title compounds. The exchange interactions within the trimers are well described by the Heisenberg model with dominant antiferromagnetic nearest-neighbor interactions J . For x = 0 , we find J Cu - Cu = − 4.74 ± 0.02 meV , which is enhanced for x = 1 to J Cu - Cu = − 4.92 ± 0.06 meV . For x = 1 and x = 2 , we find J Cu - Ni = − 0.85 ± 0.10 meV and an axial single-ion anisotropy parameter D Ni = − 0.7 ± 0.1 meV . While the x = 0 and x = 1 compounds do not exhibit long-range magnetic ordering down to 1 K , the x = 2 compound shows antiferromagnetic ordering below T N = 20 K , which is compatible with the molecular-field parameter λ = 0.63 ± 0.12 meV derived by neutron spectroscopy.
Physical Review B – American Physical Society (APS)
Published: Aug 1, 2007
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