Structural anomalies at the magnetic transition in centrosymmetric BiMnO$_3$

Details Structural anomalies at the magnetic transition in centrosymmetric BiMnO$_3$ Structural anomalies at the magnetic transition in centrosymmetric BiMnO$_3$

2007-04-26

arxiv.org/abs/0704.3548v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.75.220101

The structural properties of BiMn$O_3$ were determined from neutron powder diffraction data as a function of temperature and magnetic field. The structure at all temperatures was found to be centrosymmetric with space group $C2/c$, which is incompatible with ferroelectricity. At T$_C\simeq 100 K$, we observed the onset of a large magnetoelastic strain, proportional to the square of the magnetization. We interpret this structural rearrangement, together with the previously observed magnetodielectric anomalies, as due to the need to optimize the partially frustrated magnetic interactions.

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