Structural and magnetic investigation of Ca2MnReO6 doped with Ce

Abstract

We have studied the properties of Ce doping in Ca-site of Ca 2MnReO3 double perovskite up to 10%. These compounds have presented a monoclinic cell with P21/n space group. A small increase of lattice parameters in doped sample were observed through Rietveld refinement of X-ray diffraction pattern. The spectra at the Mn K-edge and Re L3-edge showed a mixed valence for Mn and Re in both samples. We do not observed any variation on Mn K-edge valence in XANES measurements under pressure. However a change was observed for Re L3-edge as a function of applied pressure. The Ce-doped sample showed a magnetic geometric frustration and a small decrease of the temperature frustration as compared with Ca 2MnReO6 sample. The decrease of temperature frustration can be related to the MnO6 and ReO6°Ctahedral distortion.