On the magnetically driven ferroelectric phase in GdMnO3
Abstract
Description
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.
13 pages, communication to the 11th European Meeting on Ferroelectricity, Bled (Slovenia)2007; submitted to Ferroelectrics
13 pages, communication to the 11th European Meeting on Ferroelectricity, Bled (Slovenia)2007; submitted to Ferroelectrics