Abstract
The RPA theory of dimerised singlet ground-state magnets is extended to the case of magnetic fields and anisotropic interactions. Magnetic phase diagrams are obtained by taking the static limit of the dynamic theory. The theory is applied to Cs3Cr2Br9 for which it predicts a transition to magnetic order at 2.6 T and 1.5K. It is known that the magnetic ordering occurs at higher fields, namely around 4 T. Renormalisation theory can account qualitatively for this deviation. The effect of anisotropic interactions upon the spin dynamics and the ordering properties of Cs3Cr2Br9 is discussed in some detail.
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