Magnetic Excitations of Spin-Gap System Na_3Cu_2SbO_6 with Distorted Honeycomb Structure(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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Magnetic excitation spectra of quantum spins of Na_3Cu_2SbO_6 with a distorted honeycomb structure have been measured by neutron inelastic scattering. The intensity distribution and the dispersion curves of the excitations indicate that the spin system can be well understood by considering one-dimensional spin chains formed of Cu^<2+> ions on a lattice of alternating the shorter and longer spacings along the b-axis. The exchange interactions between the neighboring spins with the shorter and longer spacings correspond to ferromagnetic and antiferromagnetic interactions, respectively. These findings are consistent with those we reported previously on the basis of macroscopic measurements. The observed gap Δ_G is 8.9meV and the energies of the antiferromagnetic and ferromagnetic interactions have been found to be 13.9 and -12.5meV, respectively.
社団法人日本物理学会の論文
2008-10-15