Abstract
We present results from an inelastic neutron scattering experiment on the candidate Heisenberg spin ladder vanadyl pyrophosphate, . We find evidence for a spin-wave excitation gap of meV at a band minimum near . This is consistent with expectations for triplet spin waves in in the spin-ladder model and represents the first confirmation in nature of a Heisenberg antiferromagnetic spin ladder.
- Received 23 May 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.2626
©1994 American Physical Society