The Curie-temperature and the saturation magnetization of double perovskites is known to depend strongly on structural and electronic degrees of freedom. We have performed a a detailed experimental study of the system A₂CrWO₆ with A = Sr, Ba and Ca. The use of different alkaline earth ions with different ionic radii on the A site results in a significant variation of the tolerance factor. The Curie temperature of polycrystalline A₂CrWO₆ samples was found to be strongly reduced for Ca₂CrWO₆ and Ba₂CrWO₆ as compared to Sr₂CrWO₆ due to a tolerance factor significantly deviating from unity resulting in deviations from the ideal perovskite structure. Electron doping by La³⁺ substitution on the A site also reduces the Curie temperature and the saturation magnetization both due to disorder and band structure effects. We also have fabricated high quality epitaxial thin
films of Sr₂CrWO₆ and studied their magnetotransport properties [1,2].

[1] J.B. Philipp et al., Appl. Phys. Lett. 79, 3654 (2001).
[2] J.B. Philipp et al., J. Appl. Phys. 93, 6853 (2003).

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/758 must be provided.

1. Synthesis, size-sorting and surface modification of magnetic nanoparticles
2. Ferromagnetic oxide heterostructures for spin electronics