TY - JOUR
T1 - EMR Study of Electronic and Magnetic Ordering in Doped CaMn1-x,yMx,yO3 (M = Ru, Mo) Perovskites
AU - Shames, A. I.
AU - Auslender, M.
AU - Rozenberg, E.
AU - Gorodetsky, G.
AU - Martin, C.
AU - Maignan, A.
PY - 2006/8/1
Y1 - 2006/8/1
N2 - 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.
AB - 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.
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VL - 108
SP - 235
JO - Acta Physica Polonica A
JF - Acta Physica Polonica A
SN - 0587-4246
IS - 8
ER -