By means of density functional theory, we investigate the magnetic ground state of edge-sharing CuO_2 spin-chains, as found in the (La,Ca,Sr)_14Cu_24O_41system, for instance. Our data rely on spin-polarized electronic structure calculations including onsite interaction (LDA+U) and an effective model for the interchain coupling. Strong doping dependence of the magnetic order is characteristic for edge-sharing CuO_2 spin-chains. We determine the ground state magnetic structure as function of the spin-chain filling and quantify the competing exchange interactions.
@article{arxiv.0710.5029,
title = {Magnetic ground state of coupled edge-sharing CuO_2 spin-chains},
author = {U. Schwingenschloegl and C. Schuster},
journal= {arXiv preprint arXiv:0710.5029},
year = {2009}
}
Comments
5 pages, 2 figures, 3 tables, accepted by Phys. Rev. Lett