Antiferromagnetic transitions in tetragonal-like BiFeO3

G. J. MacDougall,1 H. M. Christen,2,* W. Siemons,2 M. D. Biegalski,3 J. L. Zarestky,4,5 S. Liang,2,6 E. Dagotto,2,6 and S. E. Nagler1,7 1Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 4Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA 5Division of Materials Science and Engineering, Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA 6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 7CIRE, University of Tennessee, Knoxville, Tennessee 37996, USA (Received 14 July 2011; published 20 March 2012)