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Title: Resonant diffraction of synchrotron radiation: New possibilities

Abstract

Resonant diffraction of synchrotron radiation (SR) is a modern method of studying the structure and properties of condensed matter that can be implemented on third-generation synchrotrons. This method allows one to investigate local properties of media (including magnetic and electronic ones) and observe thermal vibrations, defects, and orbital and charge orderings. A brief review of the advance provided by SR resonant diffraction is presented, and the capabilities of this method for analyzing phase transitions are considered in more detail by the example of potassium dihydrogen phosphate and rubidium dihydrogen phosphate crystals. It is shown that the investigation of the temperature dependence of forbidden reflections not only makes it possible to observe the transition from para- to ferroelectric phase, but also gives information about the proton distribution at hydrogen bonds.

Authors:
 [1];  [2]
  1. Moscow State University (Russian Federation)
  2. National Research Centre “Kurchatov Institute” (Russian Federation)
Publication Date:
OSTI Identifier:
22645398
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 61; Journal Issue: 5; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; FERROELECTRIC MATERIALS; PHASE TRANSFORMATIONS; POTASSIUM; POTASSIUM PHOSPHATES; RUBIDIUM; SYNCHROTRON RADIATION; TEMPERATURE DEPENDENCE

Citation Formats

Ovchinnikova, E. N., E-mail: ovtchin@gmail.com, and Mukhamedzhanov, E. Kh.. Resonant diffraction of synchrotron radiation: New possibilities. United States: N. p., 2016. Web. doi:10.1134/S1063774516050175.
Ovchinnikova, E. N., E-mail: ovtchin@gmail.com, & Mukhamedzhanov, E. Kh.. Resonant diffraction of synchrotron radiation: New possibilities. United States. doi:10.1134/S1063774516050175.
Ovchinnikova, E. N., E-mail: ovtchin@gmail.com, and Mukhamedzhanov, E. Kh.. Thu . "Resonant diffraction of synchrotron radiation: New possibilities". United States. doi:10.1134/S1063774516050175.
@article{osti_22645398,
title = {Resonant diffraction of synchrotron radiation: New possibilities},
author = {Ovchinnikova, E. N., E-mail: ovtchin@gmail.com and Mukhamedzhanov, E. Kh.},
abstractNote = {Resonant diffraction of synchrotron radiation (SR) is a modern method of studying the structure and properties of condensed matter that can be implemented on third-generation synchrotrons. This method allows one to investigate local properties of media (including magnetic and electronic ones) and observe thermal vibrations, defects, and orbital and charge orderings. A brief review of the advance provided by SR resonant diffraction is presented, and the capabilities of this method for analyzing phase transitions are considered in more detail by the example of potassium dihydrogen phosphate and rubidium dihydrogen phosphate crystals. It is shown that the investigation of the temperature dependence of forbidden reflections not only makes it possible to observe the transition from para- to ferroelectric phase, but also gives information about the proton distribution at hydrogen bonds.},
doi = {10.1134/S1063774516050175},
journal = {Crystallography Reports},
number = 5,
volume = 61,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2016},
month = {Thu Sep 15 00:00:00 EDT 2016}
}
  • Results of measurements of the reflected beam intensity and photoelectron yield under conditions of dynamical 111/220 diffraction of synchrotron x-ray radiation are presented. The experiments were carried out on beam lines 15C and 14B at the Photon Factory. Two possible multicrystal arrangements were used for the preprocessing of the incident beam. In the first one, a double-crystal Si (111) monochromator was used for monochromation and collimation of the x-ray beam in the vertical plane and a Si (220) channel-cut crystal was used for collimation in the horizontal plane. The second crystal arrangement is based on a (111)-oriented Si crystal adjustedmore » for a six-beam Laue diffraction condition. The anomalously transmitted ({mu}{ital t}/{gamma}{sub 0} {approx} 40) beam was used as an incident beam in the x-ray standing wave measurements. The angular dependence of the total photoelectron yield was measured using a gas flow proportional counter.« less
  • We report the observation of nuclear resonant diffraction of synchrotron radiation by a synthetic multilayer. The nuclear period of the [sup 57]Fe(22 A)/Sc(11 A)/Fe(22 A)/Sc(11 A)[times]25 multilayer was chosen to be twice the electronic period to obtain a pure nuclear Bragg reflection. Strong enhancement of the radiative scattering channel provided a fast time response for the [sup 57]Fe resonant scattering at the Bragg peak, with a decay time of 4 ns. The nuclear multilayer will be useful as a narrow bandpass monochromator for synchrotron radiation.
  • The purely resonant Bragg reflections (13, 13, 0) and (14, 0, 0) in yttrium aluminum garnet Y{sub 3}Al{sub 5}O{sub 12} at energies near the K absorption edge of yttrium have been studied experimentally and theoretically. The anisotropic tensor atomic factor of yttrium corresponding to dipole-dipole resonance transitions depends on three independent parameters changing with energy. The intensities of the reflections (14, 0, 0) and (13, 13, 0) are shown to depend on the parameter difference f{sub 1}(E) - f{sub 2}(E) and the parameter f{sub 3}(E), respectively, which are attributable to distortions of the wave functions of the excited atoms andmore » change greatly with photon energy E. Studying various reflections has allowed one to determine the various components of the tensor atomic factor and to compare them with the results of numerical calculations.« less
  • Purely resonant Bragg reflections 006, 55bar 0, and 666 in a rubidium dihydrophosphate (RbH{sub 2}PO{sub 4}) crystal at the K edge of rubidium have been experimentally and theoretically investigated. These reflections remain forbidden when the resonant dipole-dipole (E1E1) contribution to the resonant atomic factor is taken into account; they may be due to the dipole-quadrupole (E1E2) transitions as well as to the anisotropy atomic factor, which is caused by thermal atomic displacements (thermally induced contribution) and/or local jumps of hydrogen atoms. A numerical simulation showed that, at room temperature (experimental conditions), the thermally induced contribution to the 'forbidden' reflections ismore » dominant.« less
  • The effect of strain (either static or caused by long-wavelength acoustic oscillations) on the energy spectrum and the azimuthal dependence of the intensity of 'forbidden' reflections in crystals at the energy of incident radiation close to the absorption edge is considered. It is shown that a strain causing a weak change in the unit-cell symmetry may additionally contribute to the tensor atomic factor. Examples of changes in the azimuthal dependence of forbidden-reflection intensity in zinc oxide ZnO and potassium dihydrogen phosphate KH{sub 2}PO{sub 4} are considered.