Journal
PHYSICAL REVIEW B
Volume 71, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.180413
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YMnO3 has an anti ferromagnetic transition at 76 K with a ferroelectric transition at much higher temperature, making it a rare example of systems-having both ferroelectric and magnetic transitions and thus a so-called multiferroic compound. Through high-resolution neutron diffraction studies, we have demonstrated here that at the antiferromagnetic transition of YMnO3 there is a strong coupling between the spin and lattice degrees of freedom splitting two Mn-O(3) and Mn-O(4) bond distances on a basal plane. This coupling then induces an unmistakable change in the electric dipole moments, i.e., a coupling between the magnetic and electric dipole moments. We discuss how this rare phenomenon can occur within a Ginzburg-Landau theory.
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