skip to main content

SciTech ConnectSciTech Connect

Title: Origin of superstructures in (double) perovskite thin films

We have investigated the origin of superstructure peaks as observed by X-ray diffraction of multiferroic Bi(Fe{sub 0.5}Cr{sub 0.5})O{sub 3} thin films grown by pulsed laser deposition on single crystal SrTiO{sub 3} substrates. The photon energy dependence of the contrast between the atomic scattering factors of Fe and Cr is used to rule out a chemically ordered double perovskite Bi{sub 2}FeCrO{sub 6} (BFCO). Structural calculations suggest that the experimentally observed superstructure occurs due to unequal cation displacements along the pseudo-cubic [111] direction that mimic the unit cell of the chemically ordered compound. This result helps to clarify discrepancies in the correlations of structural and magnetic order reported for Bi{sub 2}FeCrO{sub 6}. The observation of a superstructure in itself is not a sufficient proof of chemical order in double perovskites.
Authors:
; ; ; ; ; ; ;  [1]
  1. Institute of Materials Science, Technische Universit├Ąt Darmstadt, 64287 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
22306231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH COMPOUNDS; CATIONS; CHROMIUM COMPOUNDS; CORRELATIONS; CRYSTAL STRUCTURE; ENERGY BEAM DEPOSITION; ENERGY DEPENDENCE; IRON COMPOUNDS; LASER RADIATION; MONOCRYSTALS; OXYGEN COMPOUNDS; PEROVSKITE; PHOTONS; PULSED IRRADIATION; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS; X-RAY DIFFRACTION