Abstract
We use series expansion methods to investigate the zero-temperature phase diagram of a spin-$\frac{1}{2}$ Heisenberg frustrated bilayer model. For different parameter regions the model shows two related antiferromagnetic phases as well as a nonmagnetic dimerized phase. The phase boundaries are located to high precision and agree very well with a previous calculation using different methods. The triplon spectrum in the dimerized phase is also studied.
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