X-band electron magnetic-resonance (EMR) measurements of polycrystalline Ca Mn1-y Moy O3 (0≤y≤0.14) samples were performed at 120 K≤T≤540 K. The data obtained are compared with those of another electron-doped manganite system, Ca Mn1-x Rux O3 (0≤x≤0.40). The observed anomalies of the EMR parameters correlate pretty well with the temperatures of antiferro-, ferromagneticlike, and orbital/charge-ordering transitions in these systems. However, a strong difference is observed between the resonant properties of Mo- and Ru doped series at both paramagnetic (PM) and magnetically ordered states. To describe such a difference, the energy-band diagrams, which comprise the deep impurity t2g -like states + eg -like conductive band for Ca Mn1-x Rux O3 and shallow impurity states+conductive band, both having eg -like symmetry, for Ca Mn1-y Moy O3, are proposed. Specific electrons' contribution to the EMR linewidth at PM temperatures is introduced for the considered systems.
ASJC Scopus subject areas
- Physics and Astronomy (all)