Spin Excitations in Half-Doped Manganites

Ivon R. Buitrago; C. I. Ventura

doi:10.1007/s10948-012-1431-6

paper

Spin Excitations in Half-Doped Manganites

arXiv:1310.6714 · doi:10.1007/s10948-012-1431-6

Abstract

We investigate magnetic excitations in half-doped colossal magnetoresistance manganites. In particular, we focus on spin excitations in the CE phase originally proposed by Goodenough (Phys. Rev. 100, 564 (1955)). Using a localized spin model we calculated magnons for 3D-perovskite compounds such as La $_{1 - x}$ M $_{x}$ MnO $_{3}$ , where M=Ca,Sr,Ba, and for their 2D-laminar counterparts. We compared them with predictions for the spin excitations corresponding to other phases proposed. For the laminar half-doped manganite La $_{0.5}$ Sr $_{1.5}$ MnO $_{4}$ , for which magnon measurements by inelastic neutron scattering exist, as well as an estimation of the magnetic couplings, our calculations agree well with the experimental data.

3 pages, 4 figures Manuscript accepted: Nov.2011 Published online: 3 Jan. 2012