Dynamics of a distorted diamond chain

作者：Mikeska H J^*; Luckmann C

来源：Physical Review B, 2008, 77(5): 054405.

DOI：10.1103/PhysRevB.77.054405

We present results on the dynamics of the distorted diamond chain, S = 1/2 dimers alternating with single spins 1/2 and exchange couplings J(1) and J(3) in between. The dynamics in the spin fluid (SF) and tetramer-dimer (TD) phases is investigated numerically by exact diagonalization for up to 24 spins. Representative excitation spectra are presented both for zero magnetic field and in the 1/3 plateau phase and the relevant parameters are determined across the phase diagram. The behavior across the SF-TD phase transition line is discussed for the specific heat and for excitation spectra. The relevance of the distorted diamond chain model for the Cu(3)(CO(3))(2)(OH)(2) (azurite) material is discussed with particular emphasis on inelastic neutron scattering experiments; the recent suggestion of one possibly ferromagnetic coupling constant is not confirmed.

• 出版日期2008-2