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

• Authors: A. Shames , M. Auslender , E. Rozenberg , G. Gorodetsky , C. Martin , A. Maignan
• Languages of publication: 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

EN

75.30.Kz; 75.47.Lx; 76.30.-v; 76.50.+g

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: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 235-242

Dates

published

2005-08

received

2005-04-24

Contributors

author

A. Shames

• Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel

author

M. Auslender

• Department of Electrical Engineering, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel

author

E. Rozenberg

• Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel

author

G. Gorodetsky

• Department of Physics, Ben Gurion University of the Negev, P.O. Box 653, Be'er-Sheva 84105, Israel

author

C. Martin

• Laboratoire CRISMAT, UMR 6508, ISMRA, 14050 Caen, Cedex, France

author

A. Maignan

• Laboratoire CRISMAT, UMR 6508, ISMRA, 14050 Caen, Cedex, France

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Identifiers

DOI

10.12693/APhysPolA.108.235