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.

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• The influence of elastic strain gradient on the upper limit of flexocoupling strength, spatially-modulated phases and soft phonon dispersion in ferroics
• Lattice instabilities in bulk EuTiO3
• Structural and magnetic phase transitions in EuTi1-xNbxO3
• Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures
• Structural control of magnetic anisotropy in a strain driven multiferroic EuTiO3 thin film
• Flexocoupling induced soft acoustic mode and the spatially modulated phases in ferroelectrics
• Magnetoelastic relaxations in EuTiO3
• Effects of aging and annealing on the polar and antiferrodistortive components of the antiferroelectric transition in PZT
• Pressure-Temperature phase diagram of multiferroic EuTiO${}_3$
• Size effect of soft phonon dispersion law in nanosized ferroics
• Multiferroic behavior confined by symmetry in EuTiO3 films
• 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)
• Intrinsic structural instabilities of domain walls driven by gradient couplings: meandering anferrodistortive-ferroelectric domain walls in BiFeO3