Inelastic Neutron Scattering from the Spin Ladder Compound (VO)2P2O7

Details Inelastic Neutron Scattering from the Spin Ladder Compound (VO)2P2O7 Inelastic Neutron Scattering from the Spin Ladder Compound (VO)2P2O7

1994-06-02

arxiv.org/abs/cond-mat/9406016v1

Physics

Condensed Matter

11 pages and 2 figures (available as hard copy or postscript files from the authors, send request to RSE@ISIS-E.RUTHERFORD.AC.

Scientific paper

10.1103/PhysRevLett.73.2626

We present results from an inelastic neutron scattering experiment on the candidate Heisenberg spin ladder vanadyl pyrophosphate, (VO)2P2O7. We find evidence for a spin-wave excitation gap of $E_{gap} = 3.7\pm 0.2$ meV, at a band minimum near $Q=0.8 A^{-1}$. This is consistent with expectations for triplet spin waves in (VO)2P2O7 in the spin-ladder model, and is to our knowledge the first confirmation in nature of a Heisenberg antiferromagnetic spin ladder.

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