Change in lattice modulation upon gigantic magnetoelectric transition in GdMnO3 and TbMnO3

Details Change in lattice modulation upon gigantic magnetoelectric transition in GdMnO3 and TbMnO3 Change in lattice modulation upon gigantic magnetoelectric transition in GdMnO3 and TbMnO3

2005-08-24

arxiv.org/abs/cond-mat/0508580v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

Single-crystal synchrotron x-ray diffraction measurements in strong magnetic fields have been performed for magnetoelectric compounds GdMnO3 and TbMnO3. It has been found that the P || a ferroelectric phase induced by the application of a magnetic field at low temperatures is characterized by commensurate lattice modulation along the orthorhombic b axis with q = 1/2 and q = 1/4. The lattice modulation is ascribed to antiferromagnetic spin alignment with a modulation vector of (0 1/4 1). The change of the spin structure is directly correlated with the magnetic-field-induced electric phase transition, because any commensurate spin modulation with (0 1/4 1) should break glide planes normal to the a axis of the distorted perovskite with the Pbnm space group.

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