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

作者：Tennant DA^*; Broholm C; Reich DH; Nagler SE; Granroth GE; Barnes T; Damle K; Xu G; Chen Y; Sales BC

来源：Physical Review B, 2003, 67(5): 054414.

DOI：10.1103/PhysRevB.67.054414

We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate [Cu(NO3)(2).2.5D(2)O]. 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 qsimilar to(2n+1)pid which is consistent with the neutron scattering data.

• 出版日期2003-2-1