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Inelastic Neutron Scattering from the Spin Ladder Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mn /><mml:mo>(</mml:mo><mml:mi mathvariant="normal">VO</mml:mi><mml:mo>)</mml:mo><mml:mn /></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">P</mml:mi></mml:mrow><mml…
We present results from an inelastic neutron scattering experiment on the candidate Heisenberg spin ladder vanadyl pyrophosphate, ${(\mathrm{VO})}_{2}$${\mathrm{P}}_{2}$${\mathrm{O}}_{7}$. We find evidence for a spin-wave excitation gap of ${E}_{\mathrm{gap}}=3.7\ifmmode\pm\else\textpm\fi{}0.2$ meV at a band minimum near $Q=0.8$ ${\mathrm{\AA{}}}^{\ensuremath{-}1}$. This is consistent with expectations for triplet spin waves in ${(\mathrm{VO})}_{2}$${\mathrm{P}}_{2}$${\mathrm{O}}_{7}$ in the spin-ladder …