Emergence of a Dynamic Super-Structural Order Integrating Antiferroelectric and Antiferrodistortive Competing Instabilities in EuTiO3

Abstract

Microscopic structural instabilities of EuTiO3 single crystal were investigated by synchrotron x-ray diffraction. Antiferrodistortive (AFD) oxygen octahedral rotational order was observed alongside Ti derived antiferroelectric (AFE) distortions. The competition between the two instabilities is reconciled through a cooperatively modulated structure allowing both to coexist. The electric and magnetic field effect on the modulated AFD order shows that the origin of large magnetoelectric coupling is based upon the dynamic equilibrium between the AFD - antiferromagnetic interactions versus the electric polarization - ferromagnetic interactions.

References in corpus (2)

• Reversible Control of Magnetic Interactions by Electric Field in a Single Phase Material
• First-principles prediction of oxygen octahedral rotations in perovskite-structure EuTiO3

Cited by in corpus (9)

• Intrinsic Structural Disorder and the Magnetic Ground State in Bulk EuTiO3
• Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures
• Magnetoelastic relaxations in EuTiO3
• Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition in PZT
• Size effect of soft phonon dispersion law in nanosized ferroics
• Magnetic field driven novel phase transitions in EuTiO${}_3$
• Landau-Ginzburg theory of charge density wave formation accompanying lattice and electronic long-range ordering
• Probing phonon softening in ferroelectrics by the scanning probe microwave spectroscopy
• Flexoelectricity induced spatially modulated phases in ferroics and liquid crystals (Author review)