Phys. Rev. Lett. 79, 745–748 (1997)Magnetic Excitations in the S = 1/2 Alternating Chain Compound (VO)2P2O7Received 9 April 1997; published in the issue dated 28 July 1997 Magnetic excitations in an array of (VO)2P2O7 single crystals have been measured using inelastic neutron scattering. Until now, (VO)2P2O7 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)2P2O7 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 Δ = 3.1meV, a second excitation is observed at an energy just below 2Δ. The higher mode may be a triplet two-magnon bound state. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.745
DOI:
10.1103/PhysRevLett.79.745
PACS:
75.10.Jm, 75.10.Hk, 75.30.Ds
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