EMR Study of Electronic and Magnetic Ordering in Doped CaMn1-x,yMx,yO3 (M = Ru, Mo) Perovskites

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Abstract

X-band electron magnetic resonance measurements of polycrystalline CaMn1-x,yMx,yO3 (M = Ru, 0≤x≤0.5; M = Mo, 0≤y≤0.14) samples were performed at 120 K≤ T≤540 K. The observed anomalies of electron magnetic resonance parameters correlate pretty well with the temperatures of antiferro-, ferromagnetic-like, and orbital/charge-ordering transitions in these systems and specify phase diagrams obtained by other techniques. However, a strong difference between resonant properties of Ru- and Mo-doped series is observed in both paramagnetic and magnetically ordered states. To describe such a difference, the energy bands diagrams, which comprise the deep impurity t2g-like states + eg-like conductive band for CaMn1-xRuxO3 and shallow impurity states + conductive band, both having eg-like symmetry, for CaMn1-yMoyO3, are proposed. Specific electrons' contribution to the electron magnetic resonance line width explains concentration and temperature dependences of this parameter in the paramagnetic state in considered systems.
Original languageEnglish
Pages (from-to)235
JournalActa Physica Polonica A
Volume108
Issue number8
StatePublished - 1 Aug 2006

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