This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1107/S1600576716002405 in citations.
Please use the identifier: http://hdl.handle.net/2128/31322 in citations.
Origin of forbidden reflections in multiferroic Ba$_{2}$CoGe$_{2}$O$_{7}$ by neutron diffraction: symmetry lowering or Renninger effect?
Origin of forbidden reflections in multiferroic Ba$_{2}$CoGe$_{2}$O$_{7}$ by neutron diffraction: symmetry lowering or Renninger effect?
For a symmetry-consistent theoretical description of the multiferroic phase of Ba2CoGe2O7 a precise knowledge of its crystal structure is a prerequisite. In a previous synchrotron X-ray diffraction experiment on multiferroic Ba2CoGe2O7 at room temperature, forbidden reflections were found that favou...
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Personal Name(s): | Sazonov, Andrew (Corresponding author) |
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Meven, Martin / Roth, Georg / Georgii, Robert / Kézsmárki, István / Kocsis, Vilmos / Tokunaga, Yusuke / Taguchi, Yasujiro / Tokura, Yoshinori / Hutanu, Vladimir | |
Contributing Institute: |
Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Journal of applied crystallography, 49 (2016) 2, S. 556 - 560 |
Imprint: |
Copenhagen
Munksgaard
2016
|
DOI: |
10.1107/S1600576716002405 |
Document Type: |
Journal Article |
Research Program: |
Controlling Collective States Quantum Condensed Matter: Magnetism, Superconductivity FRM II / MLZ Jülich Centre for Neutron Research (JCNS) |
Subject (ZB): | |
Link: |
Restricted Restricted OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/31322 in citations.
For a symmetry-consistent theoretical description of the multiferroic phase of Ba2CoGe2O7 a precise knowledge of its crystal structure is a prerequisite. In a previous synchrotron X-ray diffraction experiment on multiferroic Ba2CoGe2O7 at room temperature, forbidden reflections were found that favour the tetragonal-to-orthorhombic symmetry lowering of the compound [Hutanu, Sazonov, Murakawa, Tokura, Náfrádi & Chernyshov (2011), Phys. Rev. B, 84, 212101]. Here, the results are reported of room-temperature single-crystal diffraction studies with both hot and cold neutrons to differentiate between genuine symmetry lowering and multiple diffraction (the Renninger effect). A comparison of the experimental multiple diffraction patterns with simulated ones rules out symmetry lowering. Thus, the structural model based on the tetragonal space group P\overline{4}2_{1}m was selected to describe the Ba2CoGe2O7 symmetry at room temperature. The precise structural parameters from neutron diffraction at 300 K are presented and compared with the previous X-ray diffraction results. |