Neutron-scattering study of magnetic excitations in (VO){sub 2}P{sub 2}O{sub 7}
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics, University of Florida, Gainsville, Florida 32611-0448 (United States)
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Theoretical and Computational Physics Section, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6373 (United States)
We report results from inelastic neutron-scattering experiments on powder samples of vanadyl pyrophosphate, (VO){sub 2}P{sub 2}O{sub 7} (VOPO). We see evidence for three magnetic excitations, at 3.5, 6.0, and 14 meV. The 3.5 meV mode peaks at Q=0.8 {Angstrom}{sup {minus}1} and is consistent with the one-magnon gap mode reported previously. The 6.0 meV mode is inconsistent with expectations for magnetic excitations in the usual spin-ladder model. Our results imply that VOPO must be described by a different magnetic Hamiltonian than the simple Heisenberg antiferromagnetic spin ladder. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-96OR22464; FG05-86ER45280
- OSTI ID:
- 488759
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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