To establish the microscopic model of the compound BiCu2PO6 is a challenging task. Inelastic neutron scattering experiments showed that the dispersion of this material is non-degenerate suggesting the existence of anisotropic interactions. Here we present a quantitative description of the excitation spectrum for BiCu2PO6 on the one-particle level. The solution of the isotropic frustrated spin ladder by continuous unitary transformations is the starting point of our approach. Further couplings such as isotropic interladder couplings and anisotropic interactions are included on the mean-field level. Our aim is to establish a minimal model built on the symmetry allowed interactions and to find a set of parameters, which allow us to describe the low-energy part of the dispersion without assuming unrealistic couplings.
@article{arxiv.1607.04120,
title = {Minimal model for the frustrated spin ladder system BiCu$_2$PO$_6$},
author = {Leanna Splinter and Nils A. Drescher and Holger Krull and Götz S. Uhrig},
journal= {arXiv preprint arXiv:1607.04120},
year = {2016}
}