A neutron scattering study of two-magnon states in the quantum magnet copper nitrate

Details A neutron scattering study of two-magnon states in the quantum magnet copper nitrate A neutron scattering study of two-magnon states in the quantum magnet copper nitrate

2002-07-29

arxiv.org/abs/cond-mat/0207678v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages of revtex style with 6 figures included

Scientific paper

10.1103/PhysRevB.67.054414

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.

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