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Title: Identification of inversion domains in KTiOPO{sub 4}via resonant X-ray diffraction

The identification and high-resolution mapping of the absolute crystallographic structure in multi-domain ferroelectric KTiOPO{sub 4} is achieved through a novel synchrotron X-ray diffraction method. On a single Bragg reflection, the intensity ratio in resonant diffraction below and above the Ti absorption K edge demonstrates a domain contrast up to a factor of ∼270, thus implementing a non-contact, non-destructive imaging technique with micrometre spatial resolution, applicable to samples of arbitrarily large dimensions. A novel method is presented for the identification of the absolute crystallographic structure in multi-domain polar materials such as ferroelectric KTiOPO{sub 4}. Resonant (or ‘anomalous’) X-ray diffraction spectra collected across the absorption K edge of Ti (4.966 keV) on a single Bragg reflection demonstrate a huge intensity ratio above and below the edge, providing a polar domain contrast of ∼270. This allows one to map the spatial domain distribution in a periodically inverted sample, with a resolution of ∼1 µm achieved with a microfocused beam. This non-contact, non-destructive technique is well suited for samples of large dimensions (in contrast with traditional resonant X-ray methods based on diffraction from Friedel pairs), and its potential is particularly relevant in the context of physical phenomena connected with an absence of inversion symmetry,more » which require characterization of the underlying absolute atomic structure (such as in the case of magnetoelectric coupling and multiferroics)« less
Authors:
 [1] ;  [2] ; ;  [1]
  1. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE (United Kingdom)
  2. Department of Physics, University of Warwick, Coventry, CV4 7AL (United Kingdom)
Publication Date:
OSTI Identifier:
22389065
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Crystallographica. Section A, Foundations and Advances (Online); Journal Volume: 71; Journal Issue: Pt 4; Other Information: PMCID: PMC4487424; PMID: 25970297; PUBLISHER-ID: pc5051; OAI: oai:pubmedcentral.nih.gov:4487424; Copyright (c) Federica Fabrizi et al. 2015; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; BEAMS; BRAGG REFLECTION; COUPLING; DISTRIBUTION; FERROELECTRIC MATERIALS; POTENTIALS; SPATIAL RESOLUTION; SPECTRA; SYMMETRY; SYNCHROTRON RADIATION; SYNCHROTRONS; X-RAY DIFFRACTION