Symmetry and structure of multiferroic Ba2CoGe2O7

Hutanu, V.; Sazonov, A.; Murakawa, H.; Tokura, Y.; Náfrádi, B.; Chernyshov, D.

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Symmetry and structure of multiferroic Ba₂CoGe₂O₇

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Náfrádi, B.
Max Planck Society;

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Hutanu, V., Sazonov, A., Murakawa, H., Tokura, Y., Náfrádi, B., & Chernyshov, D. (2011). Symmetry and structure of multiferroic Ba₂CoGe₂O₇. Physical Review B, 84(21): 212101.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BFB1-3

Abstract

Crystal structure of Ba(2)CoGe(2)O(7) at room temperature (RT) and 90 K has been probed by single-crystal diffraction of x-ray synchrotron radiation. The space group (SG) found at both temperatures is well approximated by P-42(1)m, in agreement with expectation for melilite-like compounds. The real structure of Ba(2)CoGe(2)O(7) is more distorted and has a lower symmetry, as follows from observation of a set of superstructure reflections violating 2(1) symmetry. Symmetry analysis based on the observed average-structure SG P-42(1)m revealed few possible candidates for the true structure that imposes different constraints on magnetic and polar properties.