EMR Study of Electronic and Magnetic Ordering in Doped CaMn 1-x, yMx, yO3 (M = Ru, Mo) perovskites

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Abstract

X-band electron magnetic resonance measurements of polycrystalline CaMn1-x, y Mx, 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 Ruand 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 + e g-like conductive band for CaMn1-xRuxO 3 and shallow impurity states + conductive band, both having e g-like symmetry, for CaMn1-y MoyO3, are proposed. Specific electrons' contribution to the electron magnetic resonance line width explains concentration and temperature dependences of this parameter in the para-magnetic state in considered systems.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalActa Physica Polonica A
Volume108
Issue number2
DOIs
StatePublished - 1 Jan 2005

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