Background:mechanism Cooperative GdFeO,distortion pc-×(S:×S) P Katsura,Nagaosa,Balatsky a PRL95,057205,2005 CCW Mostovoy PRL96,067601,2006 Sergienko,Dagotto PRB73,094434,2006 Xiang et al. PRL101,037209,2008 Malashevich,Vanderbilt Kimura,Annu.Rev.Mater.Res.37,387,2007 PRL101,037210,2008 Background: mechanism Katsura, Nagaosa, Balatsky PRL95,057205, 2005 Mostovoy PRL96, 067601, 2006 Sergienko, Dagotto PRB73,094434, 2006 Xiang et al. PRL101,037209, 2008 Malashevich, Vanderbilt PRL101,037210, 2008 Kimura, Annu. Rev. Mater. Res.37, 387, 2007 Cooperative GdFeO3 Cooperative GdFeO3 distortion distortion