title: Emergent superstructural dynamic order due to competing antiferroelectric and antiferrodistortive instabilities in bulk EuTiO3.
abstract: Microscopic structural instabilities of EuTiO3 single crystals were investigated by synchrotron x-ray diffraction. Antiferrodistortive (AFD) oxygen octahedron rotational order was observed alongside Ti derived antiferroelectric distortions. The competition between the two instabilities is reconciled through a cooperatively modulated structure allowing both to coexist. The combination of electric and magnetic fields increases the population of the modulated AFD order, illustrating how the origin of the large magnetoelectric coupling derives from the dynamic equilibrium between AFD and polar instabilities.
authors: X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. jwkim@aps.anl.gov
authors: Jong-Woo
authors: JW
authors: Kim
authors: Paul
authors: P
authors: Thompson
authors: Simon
authors: S
authors: Brown
authors: Peter S
authors: PS
authors: Normile
authors: John A
authors: JA
authors: Schlueter
authors: Andrey
authors: A
authors: Shkabko
authors: Anke
authors: A
authors: Weidenkaff
authors: Philip J
authors: PJ
authors: Ryan