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2005 | 108 | 2 | 235-242
Article title

EMR Study of Electronic and Magnetic Ordering in Doped CaMn_{1-x,y}M_{x,y}O_3 (M = Ru, Mo) Perovskites

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EN
Abstracts
EN
X-band electron magnetic resonance measurements of polycrystalline CaMn_{1-x,y}M_{x,y}O_3 (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 t_{2g}-like states + e_g-like conductive band for CaMn_{1-x}Ru_xO_3 and shallow impurity states + conductive band, both having e_g-like symmetry, for CaMn_{1-y}Mo_yO_3, 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.
Keywords
Year
Volume
108
Issue
2
Pages
235-242
Physical description
Dates
published
2005-08
received
2005-04-24
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv108n202kz
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