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In this letter we report results from inelastic neutron scatteringexperiments on powder samples of vanadyl pyrophosphate, (VO)2P2O7. We seeevidence for three magnetic excitations, at 3.5 meV, 6.0 meV and 14 meV. Theintensity of the 3.5 meV mode is strong near Q=0.8 A-1, consistent with theone-magnon gap mode reported previously and predicted by the spin-ladder model.The magnetic scattering at 14 meV may be due to the top of the one-magnon bandor the two-magnon continuum predicted in the ladder model. The 6.0 meV modealso peaks in intensity at Q=0.8 A-1. This mode has not been reportedpreviously and was not anticipated by existing theoretical treatments of thespin ladder.

physical review. b, condensed matter

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Neutron-scattering study of magnetic excitations in (VO)2P2