Crystal chemistry aspects of the magnetically induced ferroelectricity in TbMn2O5 and BiMn2O5

Details Crystal chemistry aspects of the magnetically induced ferroelectricity in TbMn2O5 and BiMn2O5 Crystal chemistry aspects of the magnetically induced ferroelectricity in TbMn2O5 and BiMn2O5

2008-05-20

arxiv.org/abs/0805.3053v3

J. Phys.: Condens. Matter 21 (2009) 015903

Physics

Condensed Matter

Materials Science

17 pages, 3 figures, 5 tables

Scientific paper

10.1088/0953-8984/21/1/015903

The origin of magnetic frustration was stated and the ions whose shift is accompanied by emerging magnetic ordering and ferroelectricity in TbMn2O5 and BiMn2O5 were determined on the basis of calculation of magnetic coupling parameters by using the structural data. The displacements accompanying the magnetic ordering are not polar, they just induce changes of bond valence (charge disordering) of Mn1 and Mn2, thus creating instability of the crystal structure. To approximate again the bond valence to the initial value (charge ordering) under magnetic ordering conditions is possible only due to polar displacement of Mn2 (or O1) and O4 ions along the b axis that is the cause of ferroelectric transition.

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