2002/05/31 by A. Weiße, Alexander Weisse, H. Fehske +1 · 1 citation
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #cond-mat.str-el
paper · pdf · doi:10.1140/epjb/e2002-00405-5
published as Eur. Phys. J. B 30, 487 (2002) · 8 pages, 12 figures; more detailed version
arxiv created 2002/09/04 · openalex publication_date 2002/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We derive a realistic microscopic model for doped colossal magnetoresistance manganites, which includes the dynamics of charge, spin, orbital and lattice degrees of freedom on a quantum mechanical level. The model respects the SU(2) spin symmetry and the full multiplet structure of the manganese ions within the cubic lattice. Concentrating on the hole doped domain (0≤ x≤ 0.5) we study the influence of the electron-lattice interaction on spin and orbital correlations by means of exact diagonalisation techniques. We find that the lattice can cause a considerable suppression of the coupling between spin and orbital degrees of freedom and show how changes in the magnetic correlations are reflected in dynamic phonon correlations. In addition, our calculation gives detailed insights into orbital correlations and demonstrates the possibility of complex orbital states.