A neutron scattering study of two-magnon states in the quantum magnet copper nitrate
arXiv:cond-mat/0207678 · doi:10.1103/PhysRevB.67.054414
Abstract
We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (Cu(NO3)2*2.5D2O). Using inelastic neutron scattering we have measured the one and two magnon excitation spectra in a large single crystal. The data are in excellent agreement with a perturbative expansion of the alternating Heisenberg Hamiltonian from the strongly dimerized limit. The expansion predicts a two-magnon bound state for q ~ (2n+1)pi*d which is consistent with the neutron scattering data.
11 pages of revtex style with 6 figures included