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| Hauptseite > Publikationsdatenbank > Origin of forbidden reflections in multiferroic Ba$_{2}$CoGe$_{2}$O$_{7}$ by neutron diffraction: symmetry lowering or Renninger effect? |
| Hauptseite > Publikationsdatenbank > Origin of forbidden reflections in multiferroic Ba$_{2}$CoGe$_{2}$O$_{7}$ by neutron diffraction: symmetry lowering or Renninger effect? |
| Journal Article | FZJ-2016-07019 |
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2016
Munksgaard
Copenhagen
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Please use a persistent id in citations: http://hdl.handle.net/2128/31322 doi:10.1107/S1600576716002405
Abstract: 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.
Keyword(s): Basic research (1st) ; Crystallography (2nd) ; Magnetism (2nd)
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