Magnetic Properties of (VO)_2P_2O_7 from Frustrated Interchain Coupling

Abstract

Neutron-scattering experiments on (VO)_2P_2O_7 reveal both a gapped magnon dispersion and an unexpected, low-lying second mode. The proximity and intensity of these modes suggest a frustrated coupling between the alternating spin chains. We deduce the minimal model containing such a frustration, and show that it gives an excellent account of the magnon dispersion, static susceptibility and electron spin resonance absorption. We consider two-magnon states which bind due to frustration, and demonstrate that these may provide a consistent explanation for the second mode.

RevTeX, 5 pages, 6 figures, compressed from first version

References in corpus (3)

• Elementary Excitations in Dimerized and Frustrated Heisenberg Chains
• Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems
• Magnetic Properties of the low dimensional spin system (VO)${}_2$P${}_2$O${}_7$: ESR and susceptibility

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