Emergence of a Dynamic Super-Structural Order Integrating   Antiferroelectric and Antiferrodistortive Competing Instabilities in EuTiO3
  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. 
Jong-Woo Kim, Paul Thompson, Simon Brown, Peter S. Normile, John A.   Schlueter, Andrey Shkabko, Anke Weidenkaff, Philip J. Ryan
cond-mat.mtrl-sci