Structural study of CaMn1−xMoxO3 (0.08 ≤ x ≤ 0.12) system by neutron powder diffraction

Neutron powder diffraction experiments and magnetic measurements in polycrystalline CaMn1−xMoxO3 (x = 0.08, 0.10, 0.12) point towards a possible charge and orbital order in this system. The analysis of structural and magnetic data show that the samples present structural phase transformation from Pnma to P21/m space group and the system has a C-type antiferromagnetic configuration at low temperature. A detailed analysis of the bond distances signals a small Jahn-Teller distortion of only one (x = 0.08) or of the two Mn ions (x = 0.10, 0.12). We identify the partially occupied eg orbitals and this explains the C-type magnetic structure.