Excitations and Possible Bound States in the S=1/2 Alternating Chain Compound (VO)2P2O7

Details Excitations and Possible Bound States in the S=1/2 Alternating Chain Compound (VO)2P2O7 Excitations and Possible Bound States in the S=1/2 Alternating Chain Compound (VO)2P2O7

1997-08-11

arxiv.org/abs/cond-mat/9708078v1

Physics

Condensed Matter

Statistical Mechanics

8 pages of Latex with 5 ps figures, To accompany invited talk by Alan Tennant at ICNS 97 17-21st August 1997 in Toronto. Submi

Scientific paper

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 DE = 3.1$ meV, a second excitation is observed at an energy just below 2DE. The higher mode may be a triplet two-magnon bound state. Numerical results in support of bound modes are presented.

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