Charge ordering and elastic constants in Fe3-xZnxO4
Physikalisches Institut, Universität Frankfurt, Robert-Mayer Strasse 2-4, 60054 Frankfurt,
2 University of Mining and Metallurgy, Department of Solid State Physics, Al. Mickiewcza 30, 30-059 Karków, Poland
3 Chemistry Department, Purdue University, West Lafayette, IN 47907, USA
Published online: 15 February 2000
We present the temperature dependence of elastic modes of FeZnxO4 with x = 0, x = 0.02 and x = 0.032. The c44 shear modes show a pronounced softening which can be normalized to a common behavior for all these substances. We can explain the softening with a bilinear coupling of the elastic strain to an order parameter linked to charge ordering processes. The other elastic modes (c11, c12 and the bulk modulus) do not show any softening. We present a symmetry analysis for the charge ordering model.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 62.65.+k – Acoustical properties of solids / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000