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26 April 2024 |
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Excitations and Possible Bound States in the S=1/2 Alternating Chain Compound (VO)2P2O7 | | Alan Tennant
; Stephen Nagler
; Ted Barnes
; Andrew Garrett
; Jose Riera
; Brian Sales
; | | Date: |
11 Aug 1997 | | Subject: | Statistical Mechanics; Strongly Correlated Electrons | cond-mat.stat-mech cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/9708078 | | Services: | Forum | Review | PDF | Favorites | |
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