High-pressure synthesis and magnetic properties of a Fe/Ru disordered quadruple perovskite CaCu3Fe2Ru2O12

Abstract

A new quadruple perovskite oxide CaCu3Fe2Ru2O12 was synthesized at 10 GPa and 1400 K. The compound crystallizes into an AA′3B4O12-type perovskite structure with space group Im3¯, where the Ca and Cu ions are 1: 3 ordered at A sites, whereas Fe and Ru ions are disordered at B sites. X-ray photoelectron spectroscopy measurement reveals the charge state formation of CaCu2+3Fe3+2Ru5+2O12. Magnetic measurement shows that ferrimagnetic phase transition occurs at TC ∼348 K. Meanwhile, in a high applied magnetic field, a rapid decrease of zero-field-cooled magnetization MZFC occurs at low temperatures (TH), which may be due to spin-reorientation transition. When the applied pressure increases, TC moves to lower temperatures implying that ferrimagnetic exchange interaction becomes weak, while TH is almost unchanged. Electrical transport measurement shows that the intrinsic electrical behavior is metallic, which is consistent with the specific heat result.