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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
; | Date: |
10 Apr 1997 | Subject: | cond-mat | 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 2Delta. The higher mode may be a triplet two-magnon bound state. | Source: | arXiv, cond-mat/9704092 | Services: | Forum | Review | PDF | Favorites |
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