On the magnetically driven ferroelectric phase in GdMnO3

Details On the magnetically driven ferroelectric phase in GdMnO3 On the magnetically driven ferroelectric phase in GdMnO3

2007-09-21

arxiv.org/abs/0709.3369v1

Physics

Condensed Matter

Materials Science

13 pages, communication to the 11th European Meeting on Ferroelectricity, Bled (Slovenia)2007; submitted to Ferroelectrics

Scientific paper

At room temperature, GdMnO3 is a paraelectric and paramagnetic with a distorted perovskite structure of orthorhombic symmetry (space group Pnma). On cooling, it undergoes a phase transition sequence to a magnetic incommensurate phase (k=delta a*; Tc1=42K) and a A-type antiferromagnetic phase (Tc2=27K). At low temperatures (T<12K), a magnetic field applied along the a-axis destabilizes the antiferromagnetic phase and induces a first order transition to a magnetic commensurate modulated phase (delta=1/4) that is also ferroelectric (P//c). This work analyses this field induced phase transition from the point of view of the symmetry and Landau theory.

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