Magnetic excitations in the trimeric compounds A${}_3$Cu${}_3$(PO${}_4$)${}_4$ (A = Ca, Sr, Pb)

M. Georgiev, H. Chamati

We study the magnetic excitations of the trimeric magnetic compounds A${}_3$Cu${}_3$(PO${}_4$)${}_4$ (A = Ca, Sr, Pb). The spectra are analyzed in terms of the Heisenberg model and a gener…