Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7

A. W. Garrett; S. E. Nagler; D. A. Tennant; B. C. Sales; T. Barnes

doi:10.1103/PhysRevLett.79.745

Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7

Condensed Matter 2016-08-31 v1

Authors: A. W. Garrett , S. E. Nagler , D. A. Tennant , B. C. Sales , T. Barnes

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Abstract

Magnetic excitations in an array of (VO)_2P_2O_7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)_2P_2O_7 has been thought of as a two-leg antiferromagnetic Heisenberg spin ladder with chains running in the a-direction. The present results show unequivocally that (VO)_2P_2O_7 is best described as an alternating spin-chain directed along the crystallographic b-direction. In addition to the expected magnon with magnetic zone-center energy gap \Delta = 3.1 meV, a second excitation is observed at an energy just below 2\Delta. The higher mode may be a triplet two-magnon bound state.

Keywords

magnetic excitations alternating spin chain inelastic neutron scattering spin-Peierls two-magnon bound state VO2P2O7

Cite

@article{arxiv.cond-mat/9704092,
  title  = {Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7},
  author = {A. W. Garrett and S. E. Nagler and D. A. Tennant and B. C. Sales and T. Barnes},
  journal= {arXiv preprint arXiv:cond-mat/9704092},
  year   = {2016}
}

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4 pages, postscript figures

Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7

Abstract

Keywords

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