Polar octahedral rotations, cation displacement and ferroelectricity in multiferroic SmCrO3 A. Ghosh, K. Dey, M. Chakraborty, S. Majumdar and S. Giri EPL, 107 4 (2014) 47012 Published online: 22 August 2014 DOI: 10.1209/0295-5075/107/47012