Spin glass state in Gd2CoMnO6 perovskite manganite

Dc magnetisation and ac susceptibility were measured on Gd2CoMnO6 perovskite manganite synthesised by solid state reaction in dc magnetic fields up to 5 T and an ac magnetic field of 1 Oe at frequencies of 21, 217 and 2000 Hz over a wide temperature range from 300 K down to 4.2 K. A spin glass transition with a very sharp transition width of 1 K at temperatures as high as 112 K was observed after the paramagnetic to ferromagnetic transition. An antiferromagnetic transition occurs at 43 K, far below the spin glass state. The spin glass transition temperature is totally suppressed at a field of 5 T.