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Abstracts
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.
Discipline
- 75.47.Lx: Magnetic oxides
- 76.50.+g: Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance(see also 75.30.Ds Spin waves)
- 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)
- 76.30.-v: Electron paramagnetic resonance and relaxation(see also 33.35.+r Electron resonance and relaxation in atomic and molecular physics; 87.80.Lg Magnetic and paramagnetic resonance in biological physics)
Journal
Year
Volume
Issue
Pages
235-242
Physical description
Dates
published
2005-08
received
2005-04-24
Contributors
author
- Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel
author
- Department of Electrical Engineering, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel
author
- Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel
author
- Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel
author
- Laboratoire CRISMAT, UMR 6508, ISMRA, 14050 Caen, Cedex, France
author
- Laboratoire CRISMAT, UMR 6508, ISMRA, 14050 Caen, Cedex, France
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv108n202kz