Structural and insulator-to-metal phase transition at 50 GPa in GdMnO3
  We present a study of the effect of very high pressure on the orthorhombic perovskite GdMnO3 by Raman spectroscopy and synchrotron x-ray diffraction up to 53.2 GPa. The experimental results yield a structural and insulator-to-metal phase transition close to 50 GPa, from an orthorhombic to a metrically cubic structure. The phase transition is of first order with a pressure hysteresis of about 6 GPa. The observed behavior under very high pressure might well be a general feature in rare-earth manganites. 
J. Agostinho Moreira, A. Almeida, J. Oliveira, V. H. Rodrigues, M. M.   R. Costa, P. B. Tavares, P. Bouvier, M. Guennou, J. ...
cond-mat.str-el