Jump to main content
Jump to site search

Issue 21, 2015
Previous Article Next Article

Phase problem in the B-site ordering of La2CoMnO6: impact on structure and magnetism

Author affiliations

Abstract

Epitaxial double perovskite La2CoMnO6 (LCMO) films were grown by metalorganic aerosol deposition on SrTiO3(111) substrates. A high Curie temperature, TC = 226 K, and large magnetization close to saturation, MS(5 K) = 5.8μB/f.u., indicate a 97% degree of B-site (Co,Mn) ordering within the film. The Co/Mn ordering was directly imaged at the atomic scale by scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy (STEM-EDX). Local electron-energy-loss spectroscopy (EELS) measurements reveal that the B-sites are predominantly occupied by Co2+ and Mn4+ ions in quantitative agreement with magnetic data. Relatively small values of the (1/2 1/2 1/2) superstructure peak intensity, obtained by X-ray diffraction (XRD), point out the existence of ordered domains with an arbitrary phase relationship across the domain boundary. The size of these domains is estimated to be in the range 35–170 nm according to TEM observations and modelling the magnetization data. These observations provide important information towards the complexity of the cation ordering phenomenon and its implications on magnetism in double perovskites, and similar materials.

Graphical abstract: Phase problem in the B-site ordering of La2CoMnO6: impact on structure and magnetism

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Mar 2015, accepted on 01 May 2015 and first published on 05 May 2015


Article type: Paper
DOI: 10.1039/C5NR01642H
Citation: Nanoscale, 2015,7, 9835-9843
  •   Request permissions

    Phase problem in the B-site ordering of La2CoMnO6: impact on structure and magnetism

    R. Egoavil, S. Hühn, M. Jungbauer, N. Gauquelin, A. Béché, G. Van Tendeloo, J. Verbeeck and V. Moshnyaga, Nanoscale, 2015, 7, 9835
    DOI: 10.1039/C5NR01642H

Search articles by author

Spotlight

Advertisements