Competition and cooperation between antiferrodistortive and ferroelectric instabilities in the model perovskite SrTiO₃

We use density functional theory to explore the interplay between octahedral rotations and ferroelectricity in the model compound SrTiO3. We find that over the experimentally relevant range octahedral rotations suppress ferroelectricity as is generally assumed in the literature. Somewhat surprisingly, we observe that at larger angles the previously weakened ferroelectric instability strengthens significantly. By analyzing geometry changes, energetics, force constants and charges, we explain the mechanisms behind this transition from competition to cooperation with increasing octahedral rotation angle.

Gallipoli: Myths and Memories in a transnational perspective

The battle of Gallipoli as it is known in Europe and South Asia or the battle of Çannakkale as it is known in modern Turkey was a seminal battle for many nations, not because it was decisive for the course of the war, but because it played a central role in regard to memory of the First World War in many nations. Based on photographic evidence and research by colleagues from many countries this contribution will focus in a transnational perspective on the participation of British, Indian, Australian and New Zealand troops in the campaign and especially on myths and memories on the side of the Entente from 1916 onwards.