k=0 magnetic structure and absence of ferroelectricity in SmFeO3
  SmFeO3 has attracted considerable attention very recently due to the reported multiferroic properties above room-temperature. We have performed powder and single crystal neutron diffraction as well as complementary polarization dependent soft X-ray absorption spectroscopy measurements on floating-zone grown SmFeO3 single crystals in order to determine its magnetic structure. We found a k=0 G-type collinear antiferromagnetic structure that is not compatible with inverse Dzyaloshinskii-Moriya interaction driven ferroelectricity. While the structural data reveals a clear sign for magneto-elastic coupling at the N\'eel-temperature of ~675 K, the dielectric measurements remain silent as far as ferroelectricity is concerned. 
C.-Y. Kuo, Y. Drees, M. T. Fern\'andez-D\'iaz, L. Zhao, L. Vasylechko,   D. Sheptyakov, A. M. T. Bell, T. W. Pi, H.-J. Lin, ...
cond-mat.str-el cond-mat.mtrl-sci